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L-Carnitine

Uses

L-carnitine is made in the body from the amino acids lysine and methionine, and is needed to release energy from fat. It transports fatty acids into mitochondria, the powerhouses of cells. In infancy, and in situations of high energy needs, such as pregnancy and breast-feeding, the need for L-carnitine can exceed production by the body. Therefore, L-carnitine is considered a "conditionally essential" nutrient.1

What Are Star Ratings?

This supplement has been used in connection with the following health conditions:

Used forWhy
3 Stars
Angina
1 gram two or three times per day
Supplementing with L-carnitine may improve heart function and ease angina symptoms.

is an amino acid needed to transport fats into the mitochondria (the place in the cell where fats are turned into energy). Adequate energy production is essential for normal heart function. Several studies using 1 gram of L-carnitine two to three times per day showed an improvement in heart function and a reduction in symptoms of angina.Coenzyme Q10 also contributes to the energy-making mechanisms of the heart. Angina patients given 150 mg of coenzyme Q10 each day have experienced greater ability to exercise without experiencing chest pain. This has been confirmed in independent investigations.

3 Stars
Congestive Heart Failure
500 mg two to three times per day with a doctor's supervision
Supplementing with L-carnitine can improve heart function and exercise capacity and reduce heart muscle damage due to insufficient oxygen.

People with CHF have insufficient oxygenation of the heart, which can damage the heart muscle. Such damage may be reduced by taking supplements. L-carnitine is a natural substance made from the amino acidslysine and methionine. Levels of L-carnitine are low in people with CHF; therefore, many doctors recommend that those with CHF take 500 mg of L-carnitine two to three times per day.

Most L-carnitine/CHF research has used a modified form of the supplement called (PC). In one double-blind trial, people using 500 mg of PC per day had a 26% increase in exercise capacity after six months. In double-blind research, other indices of heart function have also improved after taking 1 gram of PC twice per day. It remains unclear whether propionyl-L-carnitine has unique advantages over L-carnitine, as limited research in animals and humans has also shown very promising effects of the more common L-carnitine.

3 Stars
Heart Attack
2 grams daily
Taking L-carnitine may help reduce damage and complications following a heart attack.
is an amino acid important for transporting fats that can be turned into energy in the heart. Clinical trials have reported that taking L-carnitine (4–6 grams per day) increases the chance of surviving a heart attack. In one double-blind trial, individuals with suspected heart attack were given 2 grams of L-carnitine per day for 28 days. At the completion of this study, infarct size, as well as the number of nonfatal heart attacks, was lower in the group receiving L-carnitine versus the placebo group. Double-blind research using L-carnitine intravenously also shows promise.
3 Stars
Intermittent Claudication
2 grams daily
In double-blind trials, supplementing with either L-carnitine or propionyl-L-carnitine (a form of L-carnitine) has increased walking distance in people with intermittent claudication.
In double-blind trials, supplementation with L-carnitine and propionyl-L-carnitine (a form of L-carnitine) has increased walking distance in people with intermitting claudication. Walking distance was 75% greater after three weeks of L-carnitine supplementation (2 grams taken twice per day), than after supplementation with a placebo, a statistically significant difference. In the study using propionyl-L-carnitine, improvement occurred on in the those who could not walk 250 meters to begin with. In that group, maximum walking distance increase by 78% with propionyl-L-carnitine supplementation compared with a 44% increase in the placebo group, also a statistically significant difference. The amount of propionyl-L-carnitine used was 1 gram per day, increasing to 2 grams per day after two months, and 3 grams per day after an additional two months, if needed. The results of this trial have been confirmed in a large European trial.
3 Stars
Obesity
250 to 2,000 mg per day
The amino acid L-carnitine is thought to be potentially helpful for weight loss because of its role in fat metabolism.
The amino acid L-carnitine is thought to be potentially helpful for weight loss because of its role in fat metabolism. L-carnitine has been found to reduce fatigue and hunger and improve weight loss effects of fasting. Multiple controlled trials and three meta-analyses have shown that supplementing with L-carnitine can lead to small reductions in body weight in people with overweight and obesity. In a placebo-controlled trial that included 60 overweight women with polycystic ovary syndrome, taking 250 mg of L-carnitine daily for 12 weeks resulted in weight loss, waist circumference reduction, and improved glucose regulation and insulin sensitivity.
2 Stars
Attention Deficit–Hyperactivity Disorder
100 mg per 2.2 lbs (1 kg) of body weight daily, up to a maximum of 4 grams per day
In a double-blind study, supplementing with L-carnitine resulted in improvement in 54% of a group of boys with ADHD, compared with a 13% response rate in the placebo group.

In a double-blind study, supplementation with for eight weeks resulted in clinical improvement in 54% of a group of boys with ADHD, compared with a 13% response rate in the placebo group. The amount of L-carnitine used in this study was 100 mg per 2.2 pounds of body weight per day, with a maximum of 4 grams per day. No adverse effects were seen, although one child developed an unpleasant body odor while taking L-carnitine. Researchers have found that this uncommon side effect of L-carnitine can be prevented by supplementing with riboflavin. Although no serious side effects were seen in this study, the safety of long-term L-carnitine supplementation in children has not been well studied. This treatment should, therefore, be monitored by a physician.

2 Stars
Autism
50 mg per kilogram of body weight per day (half in the morning, half in the evening)
In a double-blind trial, supplementing with L-carnitine resulted in a modest improvement in disease severity in children with autism spectrum disorders.
In a double-blind trial, supplementing with L-carnitine resulted in a modest improvement in disease severity in children with autism spectrum disorders. The amount of L-carnitine used was 50 mg per kilogram of body weight per day (half in the morning and half in the evening) for three months.
2 Stars
Chronic Fatigue Syndrome
1 gram three times daily
L-carnitine is an important nutrient for energy production. Supplementation can make up for a possible deficiency.

is required for energy production in the powerhouses of cells (the mitochondria). There may be a problem in the mitochondria in people with CFS. Deficiency of carnitine has been seen in some CFS sufferers. One gram of carnitine taken three times daily for eight weeks led to improvement in CFS symptoms in one preliminary trial. Supplementation with 6 grams of L-carnitine per day for four weeks also improved fatigue in a preliminary study of patients with advanced cancer. Similar improvements were seen in another study of patients with advanced cancer given up to 3 grams of L-carnitine per day for one week.

2 Stars
Chronic Obstructive Pulmonary Disease
2 grams taken twice per day
Studies have shown that when L-carnitine is given to people with chronic lung disease, breathing during exercise improves.

has been given to people with chronic lung disease in trials investigating how the body responds to exercise. In these double-blind trials, 2 grams of L-carnitine, taken twice daily for two to four weeks, led to positive changes in breathing response to exercise.

2 Stars
Erectile Dysfunction
2 grams of each daily
In one study, supplementing with the combination of propionyl-L-carnitine (a form of L-carnitine) and acetyl-L-carnitine significantly improved erectile function in elderly men.

In a double-blind study, supplementing with the combination of propionyl-L-carnitine (a form of ) and acetyl-L-carnitine (2 grams of each per day) for six months significantly improved erectile function in elderly men with erectile dysfunction associated with low testosterone levels. Propionyl-L-carnitine and acetyl-L-carnitine were significantly more effective than testosterone treatment.

2 Stars
High Cholesterol
2 to 3 grams per day
L-carnitine has been found in some, but not all, clinical trials to reduce high cholesterol levels.
is needed by cells, including heart muscle cells, to metabolize fat into energy, and numerous clinical trials show L-carnitine helps regulate cholesterol levels. A meta-analysis that included findings from 67 randomized controlled trials found L-carnitine appeared to lower total and LDL-cholesterol, increase HDL-cholesterol, and reduce triglyceride levels; however, these benefits disappeared when age, health status, and other parameters of trials and their participants were considered. Another meta-analysis that included 55 randomized controlled trials found only doses of L-carnitine higher than 2 grams per day improved total, LDL-, and HDL-cholesterol levels. Using results from eight randomized controlled trials in a combined total of 508 participants with type 2 diabetes, another meta-analysis found L-carnitine supplementation, at doses of 2–3 grams per day for at least 12 weeks, lowered total and LDL-cholesterol levels.
2 Stars
High Triglycerides
1 to 3 grams daily
Supplementing with L-carnitine may help normalize triglyceride levels.

is another supplement that has lowered TGs in several clinical trials. However, the effect of carnitine is unpredictable, and some individuals have experienced an increase in triglyceride levels after receiving this supplement. Some doctors recommend 1–3 grams of carnitine per day, in the form known as L-carnitine.

2 Stars
Intermittent Claudication
2 grams a day of proprionyl-L-carnitine
In double-blind trials, supplementation with either L-carnitine or propionyl-L-carnitine (a form of L-carnitine) has increased walking distance in people with intermittent claudication.

In double-blind trials, supplementation with either and propionyl-L-carnitine (a form of L-carnitine) has increased walking distance in people with intermittent claudication. Walking distance was 75% greater after three weeks of L-carnitine supplementation (2 grams taken twice per day), than after supplementation with a placebo, a statistically significant difference. In the study using propionyl-L-carnitine, improvement occurred only in those who could not walk 250 meters to begin with. In that group, maximum walking distance increased by 78% with propionyl-L-carnitine supplementation compared with a 44% increase in the placebo group, also a statistically significant difference. The amount of propionyl-L-carnitine used was 1 gram per day, increasing to 2 grams per day after two months, and 3 grams per day after an additional two months, if needed. The results of this trial have been confirmed in a large European trial.

2 Stars
Male Infertility
3 grams daily
L-carnitine appears to be necessary for normal functioning of sperm cells. Supplementing with it may improve sperm motility.

is a substance made in the body and also found in supplements and some foods (such as meat). It appears to be necessary for normal functioning of sperm cells. In preliminary studies, supplementing with 3–4 grams per day for four months helped to normalize sperm motility in men with low sperm quality. While the majority of clinical trials have used L-carnitine, one preliminary trial found that acetylcarnitine (4 grams per day) may also prove useful for treatment of male infertility caused by low quantities of immobile sperm.

2 Stars
Metabolic Syndrome
2 to 3 grams daily
L-carnitine supplementation may reduce cardiovascular risk by improving metabolic parameters such as body weight, blood glucose control, insulin sensitivity, and lipid levels.
The amino acid L-carnitine has been shown in clinical trials and meta-analyses to improve blood glucose control, insulin sensitivity, weight loss, and lipid metabolism, indicating its potential usefulness in treating metabolic syndrome and reducing cardiovascular risk. In one placebo-controlled trial, women with obesity and type 2 diabetes participated in a low-calorie diet program and received 2 grams of L-carnitine per day or placebo for about eight weeks. At the end of the trial, those receiving L-carnitine had greater improvements in blood glucose control, insulin sensitivity, cholesterol and triglyceride levels. In an uncontrolled trial, taking 3 grams of L-carnitine daily for three months led to decreased insulin resistance, LDL-cholesterol levels, and body-mass index (BMI), and increased HDL-cholesterol levels in 80 women with polycystic ovary syndrome, a condition associated with metabolic syndrome.
2 Stars
Multiple Sclerosis and Drug-Induced Fatigue
3 to 6 grams daily
Some drugs that are used to treat MS appear to deplete carnitine. In one trial, supplementing with L-carnitine significantly improved fatigue in 63% of drug-treated MS patients.

Some drugs that are used to treat MS appear to deplete carnitine. In a preliminary trial, supplementation with 3 to 6 grams of per day significantly improved fatigue in 63% of drug-treated MS patients.

2 Stars
Sickle Cell Anemia
50 mg per 2.2 lbs (1 kg) of body weight daily
In a study of children with sickle cell anemia, supplementing with L-carnitine reduced the number of painful crises and improved abnormal heart function and pulmonary hypertension.

In a preliminary study of children with sickle cell anemia, supplementing with (50 mg per 2.2 pounds of body weight per day for six months) significantly reduced the number of painful crises and significantly improved the abnormal heart function (diastolic dysfunction) that was present in most of the children. L-carnitine supplementation also significantly improved pulmonary hypertension in the children who had this abnormality prior to treatment.

2 Stars
Sprains and Strains and Exercise-Related Muscle Injury
3 grams per day
One trial showed that people who take L-carnitine for three weeks before engaging in an exercise regimen are less likely to experience muscle soreness.

One controlled trial showed that people who supplement with 3 grams per day for three weeks before engaging in an exercise regimen are less likely to experience muscle soreness.

2 Stars
Thalassemia
50 to 100 mg per 2.2 lbs (1 kg) of body weight daily
Studies have shown that propionyl-L-carnitine (a form of L-carnitine) protects red blood cells of people with thalassemia against free radical damage. Supplementing with it may reduce the need for blood transfusions.

Test tube studies have shown that propionyl-L-carnitine (a form of ) protects red blood cells of people with thalassemia against free radical damage. In a preliminary study, children with beta thalassemia major who took 100 mg of L-carnitine per 2.2 pounds of body weight per day for three months had a significantly decreased need for blood transfusions. Some studies have found people with thalassemia to be frequently deficient in folic acid, vitamin B12, and zinc. Researchers have reported improved growth rates in zinc-deficient thalassemic children who were given zinc supplements of 22.5 to 90 mg per day, depending on age.Magnesium has been reported to be low in thalassemia patients in some, but not all, studies. A small, preliminary study reported that oral supplements of magnesium, 7.2 mg per 2.2 pounds of body weight per day, improved some red blood cell abnormalities in thalassemia patients.

2 Stars
Type 1 Diabetes
1,500 to 2,000 mg daily
Supplementing with acetyl l-carnitine may reduce symptoms of diabetic neuropathy in people with type 1 diabetes.
Acetyl l-carnitine is an amino acid compound used to treat conditions affecting the brain and peripheral nervous system. Research reviews have concluded acetyl l-carnitine, in doses of at least 2 grams per day, can relieve pain and improve nerve function in those with diabetic nerve damage (neuropathy). A preliminary trial found 500 mg of acetyl l-carnitine three times daily for 24 weeks relieved symptoms of diabetic nerve damage (neuropathy) as effectively as vitamin B12.
2 Stars
Type 2 Diabetes
2 to 4 grams daily
Supplementing with L-carnitine may reduce glucose, cholesterol, and triglyceride levels, and support medical therapies for type 2 diabetes.
L-carnitine is an amino acid needed to properly utilize fat for energy. By supporting healthy fat metabolism, L-carnitine plays an important role in preserving normal insulin sensitivity and glycemic control. People with type 2 diabetes have been found to have lower levels of circulating L-carnitine than healthy people, and in people with type 2 diabetes, lower blood L-carnitine levels are correlated with higher blood glucose and triglyceride levels, lower free radical-quenching capacity, and greater risk of diabetes complications. Supplementing with L-carnitine has been shown in multiple human and animal studies to improve glucose tolerance and lipid metabolism in the context of insulin resistance. A meta-analysis of randomized controlled trials concluded 2–4 grams of L-carnitine per day can effectively reduce fasting blood glucose, total cholesterol, and LDL-cholesterol levels. Clinical trials further show the potential for 2–4 grams of L-carnitine per day to augment other therapies for improving metabolism in people with diabetes, including glimepiride, orlistat, sibutramine, simvastatin, and a low-calorie diet. In addition, a placebo-controlled trial found 600 mg per day of L-carnitine alleviated diabetes-related muscle cramps (a form of diabetic neuropathy) in people with type 2 diabetes.
1 Star
Asthma
Refer to label instructions
In a double-blind trial, supplementing with L-carnitine improved lung function and overall asthma control, compared with a placebo, in children with asthma.
In a double-blind trial, supplementing with L-carnitine (1,050 mg each morning for six months) improved lung function and overall asthma control, compared with a placebo, in Egyptian children with asthma.
1 Star
Athletic Performance
Refer to label instructions
L-carnitine has been popular as a potential aid in improving athletic performance because of its role in converting fat to energy. Some studies have found that it improves certain measures of muscle physiology.

, which is normally manufactured by the human body, has been popular as a potential ergogenic aid (i.e., having the ability to increase work capacity), because of its role in the conversion of fat to energy. However, while some studies have found that L-carnitine improves certain measures of muscle physiology, research on the effects of 2 to 4 grams of L-carnitine per day on performance have produced inconsistent results. L-carnitine may be effective in certain intense exercise activities leading to exhaustion, but recent studies have reported that L-carnitine supplementation does not benefit non-exhaustive or even marathon-level endurance exercise, anaerobic performance, or lean body mass in weight lifters.

1 Star
Cardiomyopathy
Refer to label instructions
Inherited forms of cardiomyopathy seen in children may be responsive to L-carnitine.

Deficiency of , an amino acid, is associated with the development of some forms of cardiomyopathy. Inherited forms of cardiomyopathy seen in children may be the most responsive to therapy with L-carnitine. Whether carnitine supplementation helps the average person with cardiomyopathy remains unknown. Nonetheless, some doctors recommend 1 to 3 grams of carnitine per day for adults of average weight.

1 Star
Liver Cirrhosis
Refer to label instructions
L-carnitine injections have been used to improve circulation to the liver in people with cirrhosis.

injections have been used to improve circulation to the liver in people with cirrhosis, but trials of the oral supplement are lacking.

1 Star
Mitral Valve Prolapse
Refer to label instructions
In one report, deficient levels of L-carnitine were found in five people with MVP. One person was given L-carnitine and experienced a complete resolution of MVP symptoms.

In one report, deficient levels of were found in five consecutive people with MVP. One of these people was given L-carnitine (1 gram three times per day for four months) and experienced a complete resolution of the symptoms associated with MVP.

1 Star
Raynaud’s Disease
Refer to label instructions
In one study, people with Raynaud’s disease who were given L-carnitine showed less blood-vessel spasm in their fingers in response to cold exposure.

In one study, 12 people with Raynaud’s disease were given (1 gram three times a day) for 20 days. After receiving L-carnitine, these people showed less blood-vessel spasm in their fingers in response to cold exposure.

How It Works

How to Use It

Most people do not need carnitine supplements. For therapeutic use, typical amounts are 1–3 grams per day.

It remains unclear whether the propionyl-L-carnitine form of carnitine used in congestive heart failure research has greater benefits than the L-carnitine form, since limited research in both animals and humans with the more common L-carnitine has also shown very promising effects.2

Where to Find It

Dairy and red meat contain the greatest amounts of carnitine. Therefore, people who have a limited intake of meat and dairy products tend to have lower L-carnitine intakes.

Possible Deficiencies

Carnitine deficiencies are rare, even in strict vegetarians, because the body produces carnitine relatively easily.

Rare genetic diseases can cause a carnitine deficiency. Also, deficiencies are occasionally associated with other diseases, such as diabetes and cirrhosis.3, 4 Among people with diabetes, carnitine deficiency is more likely to be found in persons experiencing complications of diabetes (such as retinopathy, hyperlipidemia, or neuropathy), suggesting that carnitine deficiency may play a role in the development of these complications.5 A carnitine deficiency can also result from oxygen deprivation which can occur in some heart conditions. In Italy, L-carnitine is prescribed for heart failure, heart arrhythmias, angina, and lack of oxygen to the heart.6

Best Form to Take

Derivatives of L-carnitine, specifically propionyl-L-carnitine and acetyl-L-carnitine, are available in supplement form, and have been used in some studies. Propionyl-L-carnitine has been used in some studies as an alternative to L-carnitine; it reportedly has greater affinity for cardiac and skeletal muscle than L-carnitine. Although acetyl-L-carnitine can be a source of L-carnitine and shows benefits in its own right, the use of L-carnitine and acetyl-L-carnitine are not interchangeable. DL-carnitine, which is a mix of L-carnitine and its isomer, D-carnitine, is no longer used due to concerns about D-carnitine’s safety and its interference with the L-isomer.7

Interactions

Interactions with Supplements, Foods, & Other Compounds

The body needs lysine, methionine, vitamin C, iron, niacin, and vitamin B6 to produce carnitine.

Interactions with Medicines

Certain medicines interact with this supplement.

What Are Drug Interactions
Types of interactions:BeneficialAdverseCheck

Replenish Depleted Nutrients

  • AZT

    Preliminary information suggests that muscle damage sometimes caused by AZT is at least partially due to depletion of carnitine in the muscles by the drug. It has been reported that most patients taking AZT have depleted carnitine levels that can be restored with carnitine supplementation (6 grams per day).

  • Carbamazepine

    Several controlled and preliminary studies showed that multiple drug therapy for seizures results in dramatic reductions in blood carnitine levels. Further controlled research is needed to determine whether children taking anticonvulsants might benefit by supplementing with L-carnitine, since current studies yield conflicting results. For example, one controlled study indicated that children taking valproic acid and carbamazepine received no benefit from supplementing with L-carnitine. However, another small study revealed that children taking valproic acid experienced less fatigue and excessive sleepiness following L-carnitine supplementation. Despite the lack of well-controlled studies, individuals who are taking anticonvulsants and experiencing side effects might benefit from supplementing with L-carnitine.

  • Cefditoren Pivoxil
    In a case report, a woman developed visual disturbances and abnormal brain function, in association with subnormal blood levels of carnitine, after treatment with cefditoren pivoxil. The abnormalities resolved after supplementation with L-carnitine. People taking cefditoren pivoxil should ask their doctor whether taking an L-carnitine supplement is appropriate.
  • Felbamate

    Several controlled and preliminary studies showed that multiple drug therapy for seizures results in dramatic reductions in blood carnitine levels. Further controlled research is needed to determine whether children taking anticonvulsants might benefit by supplementing with L-carnitine, since current studies yield conflicting results. For example, one controlled study indicated that children taking valproic acid and carbamazepine received no benefit from supplementing with L-carnitine. However, another small study revealed that children taking valproic acid experienced less fatigue and excessive sleepiness following L-carnitine supplementation. Despite the lack of well-controlled studies, individuals who are taking anticonvulsants and experiencing side effects might benefit from supplementing with L-carnitine.

  • Levetiracetam

    Several controlled and preliminary studies showed that multiple drug therapy for seizures results in dramatic reductions in blood carnitine levels. Further controlled research is needed to determine whether children taking anticonvulsants might benefit by supplementing with L-carnitine, since current studies yield conflicting results. For example, one controlled study indicated that children taking valproic acid and carbamazepine received no benefit from supplementing with L-carnitine. However, another small study revealed that children taking valproic acid experienced less fatigue and excessive sleepiness following L-carnitine supplementation. Despite the lack of well-controlled studies, individuals who are taking anticonvulsants and experiencing side effects might benefit from supplementing with L-carnitine.

  • Oxcarbazepine

    Several controlled and preliminary studies showed that multiple drug therapy for seizures results in dramatic reductions in blood carnitine levels. Further controlled research is needed to determine whether children taking anticonvulsants might benefit by supplementing with L-carnitine, since current studies yield conflicting results. For example, one controlled study indicated that children taking valproic acid and carbamazepine received no benefit from supplementing with L-carnitine. However, another small study revealed that children taking valproic acid experienced less fatigue and excessive sleepiness following L-carnitine supplementation. Despite the lack of well-controlled studies, individuals who are taking anticonvulsants and experiencing side effects might benefit from supplementing with L-carnitine.

  • Phenobarbital
    One controlled study showed that taking phenobarbital resulted in reduced blood levels of L-carnitine.[REF] Further research is needed to determine whether people taking phenobarbital might benefit from supplemental L-carnitine. Based on the currently available information, some healthcare practitioners may recommend monitoring L-carnitine blood levels or supplementing with L-carnitine.
  • Phenytoin

    Several controlled and preliminary studies showed that multiple drug therapy for seizures results in dramatic reductions in blood carnitine levels. Further controlled research is needed to determine whether children taking anticonvulsants might benefit by supplementing with L-carnitine, since current studies yield conflicting results. For example, one controlled study indicated that children taking valproic acid and carbamazepine received no benefit from supplementing with L-carnitine. However, another small study revealed that children taking valproic acid experienced less fatigue and excessive sleepiness following L-carnitine supplementation. Despite the lack of well-controlled studies, individuals who are taking anticonvulsants and experiencing side effects might benefit from supplementing with L-carnitine.

  • Primidone

    Several controlled and preliminary studies showed that multiple drug therapy for seizures results in dramatic reductions in blood carnitine levels. Further controlled research is needed to determine whether children taking anticonvulsants might benefit by supplementing with L-carnitine, since current studies yield conflicting results. For example, one controlled study indicated that children taking valproic acid and carbamazepine received no benefit from supplementing with L-carnitine. However, another small study revealed that children taking valproic acid experienced less fatigue and excessive sleepiness following L-carnitine supplementation. Despite the lack of well-controlled studies, individuals who are taking anticonvulsants and experiencing side effects might benefit from supplementing with L-carnitine.

  • Topiramate

    Several controlled and preliminary studies showed that multiple drug therapy for seizures results in dramatic reductions in blood carnitine levels. Further controlled research is needed to determine whether children taking anticonvulsants might benefit by supplementing with L-carnitine, since current studies yield conflicting results. For example, one controlled study indicated that children taking valproic acid and carbamazepine received no benefit from supplementing with L-carnitine. However, another small study revealed that children taking valproic acid experienced less fatigue and excessive sleepiness following L-carnitine supplementation. Despite the lack of well-controlled studies, individuals who are taking anticonvulsants and experiencing side effects might benefit from supplementing with L-carnitine.

  • Zonisamide

    Several controlled and preliminary studies showed that multiple drug therapy for seizures results in dramatic reductions in blood carnitine levels. Further controlled research is needed to determine whether children taking anticonvulsants might benefit by supplementing with L-carnitine, since current studies yield conflicting results. For example, one controlled study indicated that children taking valproic acid and carbamazepine received no benefit from supplementing with L-carnitine. However, another small study revealed that children taking valproic acid experienced less fatigue and excessive sleepiness following L-carnitine supplementation. Despite the lack of well-controlled studies, individuals who are taking anticonvulsants and experiencing side effects might benefit from supplementing with L-carnitine.

Reduce Side Effects

  • Abiraterone

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Abiraterone, Submicronized

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Acalabrutinib

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Acalabrutinib Maleate

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Aldesleukin

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Alemtuzumab

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Amifostine Crystalline

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Anastrozole

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Apalutamide

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Arsenic Trioxide

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Asciminib

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Asparaginase

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Avapritinib

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Axitinib

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Azacitidine

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • AZT

    Severe peripheral neuropathy (painful sensations due to nerve damage in the hands and feet) often develops in people taking stavudine or other drugs in its class. People with peripheral neuropathy who were taking one of these drugs were found to be deficient in acetyl-L-carnitine. In a preliminary trial, supplementing with 1,500 mg of acetyl-L-carnitine twice a day resulted in improvement in the neuropathy after six months in people taking stavudine or related drugs. Similar benefits were seen in another study that used the same amount of acetyl-L-carnitine.

  • BCG Live

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Belinostat

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Bevacizumab

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Bexarotene

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Bicalutamide

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Bleomycin

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Bortezomib

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Bosutinib

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Busulfan

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Cabazitaxel

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Cabozantinib

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Capecitabine

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Capmatinib

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Carboplatin

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Carfilzomib

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Carmustine

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Ceritinib

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Cetuximab

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Chlorambucil

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Cisplatin

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Cladribine

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Clofarabine

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Crizotinib

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Cromolyn

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Cytarabine

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Cytarabine Liposome

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Dabrafenib

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Dactinomycin

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Darolutamide

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Dasatinib

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Daunorubicin

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Daunorubicin Liposome

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Decitabine

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Degarelix

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Denileukin Diftitox

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Dexrazoxane

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Didanosine

    Severe peripheral neuropathy (painful sensations due to nerve damage in the hands and feet) often develops in people taking stavudine or other drugs in its class. People with peripheral neuropathy who were taking one of these drugs were found to be deficient in acetyl-L-carnitine. In a preliminary trial, supplementing with 1,500 mg of acetyl-L-carnitine twice a day resulted in improvement in the neuropathy after six months in people taking stavudine or related drugs. Similar benefits were seen in another study that used the same amount of acetyl-L-carnitine.

  • Docetaxel

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Doxorubicin

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Doxorubicin Liposomal

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Elacestrant

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Emtricitabine

    Severe peripheral neuropathy (painful sensations due to nerve damage in the hands and feet) often develops in people taking stavudine or other drugs in its class. People with peripheral neuropathy who were taking one of these drugs were found to be deficient in acetyl-L-carnitine. In a preliminary trial, supplementing with 1,500 mg of acetyl-L-carnitine twice a day resulted in improvement in the neuropathy after six months in people taking stavudine or related drugs. Similar benefits were seen in another study that used the same amount of acetyl-L-carnitine.

  • Entrectinib

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Enzalutamide

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Epirubicin

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Eribulin

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Erlotinib

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Estramustine

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Etoposide

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Etoposide Phosphate

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Everolimus

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Exemestane

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Floxuridine

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Fludarabine

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Fluorouracil

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Flutamide

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Fruquintinib

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Fulvestrant

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Gefitinib

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Gemcitabine

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Gemtuzumab Ozogamicin

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Goserelin

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Hydroxyurea

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Ibrutinib

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Idarubicin

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Ifosfamide

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Imatinib

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Interferon Alfa-2a
    In a randomized trial, patients with chronic hepatitis C who were being treated with Peg-interferon-alpha 2b and ribavirin were randomly assigned to receive L-carnitine (2 grams twice a day) or no L-carnitine (control group). Compared with the control group, fewer patients in the L-carnitine group had to reduce the medication dosage or discontinue treatment because of side effects such as anemia or a decline in the white blood cell count.
  • Interferon Alfa-2B

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Interferon Alfacon-1
    In a randomized trial, patients with chronic hepatitis C who were being treated with Peg-interferon-alpha 2b and ribavirin were randomly assigned to receive L-carnitine (2 grams twice a day) or no L-carnitine (control group). Compared with the control group, fewer patients in the L-carnitine group had to reduce the medication dosage or discontinue treatment because of side effects such as anemia or a decline in the white blood cell count.
  • Ipilimumab

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Irinotecan

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Irinotecan Liposomal

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Isoniazid
    Some drugs used to treat tuberculosis (including isoniazid, rifampin, and pyrazinamide) may cause liver damage. In a double-blind study of patients starting treatment for tuberculosis with the combination of isoniazid, rifampin, ethambutol, and pyrazinamide, supplementation with L-carnitine (1,000 mg twice a day for 4 weeks) significantly decreased the number of patients who developed drug-induced liver damage (17% with L-carnitine, 32% with placebo).
  • Ixabepilone

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Ixazomib

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Kit For Indium-111-Ibritumomab

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Kit For Yttrium-90-Ibritumomab

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Lamivudine

    Severe peripheral neuropathy (painful sensations due to nerve damage in the hands and feet) often develops in people taking stavudine or other drugs in its class. People with peripheral neuropathy who were taking one of these drugs were found to be deficient in acetyl-L-carnitine. In a preliminary trial, supplementing with 1,500 mg of acetyl-L-carnitine twice a day resulted in improvement in the neuropathy after six months in people taking stavudine or related drugs. Similar benefits were seen in another study that used the same amount of acetyl-L-carnitine.

  • Lapatinib

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Lenalidomide

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Lenvatinib

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Letrozole

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Leucovorin

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Leuprolide

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Leuprolide (3 Month)

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Leuprolide (4 Month)

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Leuprolide (6 Month)

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Levoleucovorin Calcium

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Lomustine

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Margetuximab-Cmkb

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Mechlorethamine

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Medroxyprogesterone

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Megestrol

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Melphalan

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Melphalan Flufenamide

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Melphalan Hcl

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Melphalan Hcl-Betadex Sbes

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Mercaptopurine

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Mesna

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Methotrexate

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Methoxsalen

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Midostaurin

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Mitomycin

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Mitotane

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Mitoxantrone

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Mobocertinib

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Necitumumab

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Nelarabine

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Nilotinib

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Nilutamide

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Nintedanib

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Obinutuzumab

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Ofatumumab

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Oxaliplatin

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Paclitaxel

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Paclitaxel-Protein Bound

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Panitumumab

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Panobinostat

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Pazopanib

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Pegaspargase

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Peginterferon Alfa-2a
    In a randomized trial, patients with chronic hepatitis C who were being treated with Peg-interferon-alpha 2b and ribavirin were randomly assigned to receive L-carnitine (2 grams twice a day) or no L-carnitine (control group). Compared with the control group, fewer patients in the L-carnitine group had to reduce the medication dosage or discontinue treatment because of side effects such as anemia or a decline in the white blood cell count.
  • Peginterferon Alfa-2b
    In a randomized trial, patients with chronic hepatitis C who were being treated with Peg-interferon-alpha 2b and ribavirin were randomly assigned to receive L-carnitine (2 grams twice a day) or no L-carnitine (control group). Compared with the control group, fewer patients in the L-carnitine group had to reduce the medication dosage or discontinue treatment because of side effects such as anemia or a decline in the white blood cell count.
  • Pemetrexed

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Pentostatin

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Pertuzumab

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Pertuzumab-Trastuzumab-Hy-Zzxf

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Pexidartinib

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Pirtobrutinib

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Polifeprosan 20 with Carmustine

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Pomalidomide

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Ponatinib

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Pralatrexate

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Pyrazinamide
    Some drugs used to treat tuberculosis (including isoniazid, rifampin, and pyrazinamide) may cause liver damage. In a double-blind study of patients starting treatment for tuberculosis with the combination of isoniazid, rifampin, ethambutol, and pyrazinamide, supplementation with L-carnitine (1,000 mg twice a day for 4 weeks) significantly decreased the number of patients who developed drug-induced liver damage (17% with L-carnitine, 32% with placebo).
  • Radium Ra 223 Dichloride

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Regorafenib

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Relugolix

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Repotrectinib

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Ribavirin
    In a randomized trial, patients with chronic hepatitis C who were being treated with Peg-interferon-alpha 2b and ribavirin were randomly assigned to receive L-carnitine (2 grams twice a day) or no L-carnitine (control group). Compared with the control group, fewer patients in the L-carnitine group had to reduce the medication dosage or discontinue treatment because of side effects such as anemia or a decline in the white blood cell count.
  • Rifampin
    Some drugs used to treat tuberculosis (including isoniazid, rifampin, and pyrazinamide) may cause liver damage. In a double-blind study of patients starting treatment for tuberculosis with the combination of isoniazid, rifampin, ethambutol, and pyrazinamide, supplementation with L-carnitine (1,000 mg twice a day for 4 weeks) significantly decreased the number of patients who developed drug-induced liver damage (17% with L-carnitine, 32% with placebo).
  • Ripretinib

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Rituximab

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Rituximab-Hyaluronidase,Human

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Romidepsin

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Ropeginterferon Alfa-2b-Njft

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Samarium Sm 153 Lexidronam

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Sipuleucel-T In Lr

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Sorafenib

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Stavudine

    Severe peripheral neuropathy (painful sensations due to nerve damage in the hands and feet) often develops in people taking stavudine or other drugs in its class. People with peripheral neuropathy who were taking one of these drugs were found to be deficient in acetyl-L-carnitine. In a preliminary trial, supplementing with 1,500 mg of acetyl-L-carnitine twice a day resulted in improvement in the neuropathy after six months in people taking stavudine or related drugs. Similar benefits were seen in another study that used the same amount of acetyl-L-carnitine.

  • Strontium-89 Chloride

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Sulfacetamide

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Sunitinib

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Tamoxifen

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Temsirolimus

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • TeniposIde

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Tepotinib

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Thioguanine

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Thiotepa

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by cisplatin.

  • Tivozanib

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Topotecan

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Toremifene

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Trametinib

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Trastuzumab

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Trastuzumab-Hyaluronidase-Oysk

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Tremelimumab-Actl

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Tretinoin (Chemotherapy)

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Triptorelin Pamoate

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Umbralisib

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Valrubicin

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Vandetanib

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Vemurafenib

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Vinblastine

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Vincristine

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Vincristine Sulfate Liposomal

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Vinorelbine

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Zanubrutinib

    Acetyl-L-carnitine in the amount of 1,000 mg three times per day for eight weeks has been shown to improve nerve damage (neuropathy) caused by the chemotherapy drug cisplatin.

  • Zidovudine

    Severe peripheral neuropathy (painful sensations due to nerve damage in the hands and feet) often develops in people taking stavudine or other drugs in its class. People with peripheral neuropathy who were taking one of these drugs were found to be deficient in acetyl-L-carnitine. In a preliminary trial, supplementing with 1,500 mg of acetyl-L-carnitine twice a day resulted in improvement in the neuropathy after six months in people taking stavudine or related drugs. Similar benefits were seen in another study that used the same amount of acetyl-L-carnitine.

Support Medicine

  • none

Reduces Effectiveness

  • none

Potential Negative Interaction

  • none

Explanation Required

  • Allopurinol

    People who have Duchenne muscular dystrophy have low levels of L-carnitine in their muscles. Allopurinol restores L-carnitine to normal levels, resulting in improved muscle strength. Whether L-carnitine supplementation might improve this effect of allopurinol has not been investigated.

  • Gabapentin

    Several controlled and preliminary studies showed that multiple drug therapy for seizures results in dramatic reductions in blood carnitine levels. Further controlled research is needed to determine whether children taking anticonvulsants might benefit by supplementing with L-carnitine, since current studies yield conflicting results. For example, one controlled study indicated that children taking valproic acid and carbamazepine received no benefit from supplementing with L-carnitine. However, another small study revealed that children taking valproic acid experienced less fatigue and excessive sleepiness following L-carnitine supplementation. Despite the lack of well-controlled studies, individuals who are taking anticonvulsants and experiencing side effects might benefit from supplementing with L-carnitine.

  • Valproate

    Valproic acid causes depletion of carnitine in children, and blood carnitine levels are often low in people taking valproic acid for long periods of time. While there have been several case reports of valproic acid-related carnitine deficiency causing abdominal pain in children, there is controversy about the need for carnitine supplements in children taking valproic acid.

    Complete disappearance of severe valproic acid-induced abdominal pain was achieved in one child with intractable epilepsy immediately following the introduction of 300 mg per day of . Carnitine supplementation (50 mg per 2.2 pounds of body weight) has protected children from valproic acid-induced increases in blood ammonia levels in some research, though other published work has questioned whether the depletion of carnitine and the increase in blood ammonia levels (both caused by valproic acid) are actually related to each other. This last report found that the depletion of carnitine was significantly more severe when epileptics were taking valproic acid together with other anti-seizure medications. A double-blind, crossover study found that carnitine supplementation (100 mg per 2.2 pounds of body weight) was no more effective than placebo in improving the sense of well-being in children treated with valproic acid. To date, the question of whether carnitine supplementation is beneficial for people taking valproic acid remains unresolved. However, a panel of pediatric neurologists and experts on L-carnitine supplementation strongly recommended oral L-carnitine supplementation for all infants and children taking valproic acid, as well as for adults with carnitine deficiency syndromes, people with valproic acid-induced liver and kidney toxicity, people on kidney dialysis, and premature infants on total parenteral nutrition (intravenous feeding). The panel recommended an amount of 100 mg per 2.2 pounds of body weight per day, up to a maximum of 2 grams per day.

The Drug-Nutrient Interactions table may not include every possible interaction. Taking medicines with meals, on an empty stomach, or with alcohol may influence their effects. For details, refer to the manufacturers’ package information as these are not covered in this table. If you take medications, always discuss the potential risks and benefits of adding a supplement with your doctor or pharmacist.

Side Effects

Side Effects

At the time of writing, there were no well-known side effects caused by this supplement.

References

1. Giovannini M, Agostoni C, Salari PC. Is carnitine essential in children? J Int Med Res 1991;19:88-102.

2. Kobayashi A, Masumura Y, Yamazaki N. L-carnitine treatment for congestive heart failure—experimental and clinical study. Jpn Circ J 1992;56:86-94.

3. Dipalma JR. Carnitine deficiency. Am Fam Physician 1988;38:243-51.

4. Kendler BS. Carnitine: an overview of its role in preventive medicine. Prev Med 1986;15:373-90.

5. Tamamogullari N, Silig Y, Icagasioglu S, Atalay A. Carnitine deficiency in diabetes mellitus complications. J Diabetes Complications 1999;13:251-3.

6. Del Favero A. Carnitine and gangliosides. Lancet 1988;2:337 [letter].

7. Gaby, AR. Nutritional Medicine. Concord, NH: Fritz Perlberg Publishing, 2011.

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