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Acetyl-L-Carnitine

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How does Acetyl-l-carnitine work?

Acetyl-L-carnitine helps the body produce energy. It is important for heart and brain function, muscle movement, and many other body processes.

Are there safety concerns?

Acetyl-L-carnitine is LIKELY SAFE for most adults and POSSIBLY SAFE for most children when taken by mouth. It can cause some side effects including stomach upset, nausea, vomiting, dry mouth, headache, and restlessness. It can also cause a "fishy" odor of the urine, breath, and sweat.

Acetyl-L-carnitine is POSSIBLY SAFE for most adults when given by another route than by mouth. Use only under medical supervision.

Special Precautions & Warnings:

Pregnancy and breast-feeding: Not enough is known about the use of acetyl-L-carnitine during pregnancy and breast-feeding. Stay on the safe side and avoid use.

Nerve pain (neuropathy) caused by chemotherapy: Acetyl-L-carnitine might worsen symptoms in some people with nerve pain caused by a class of chemotherapy drugs known as taxanes.

Under-active thyroid (hypothyroidism): There is some concern that acetyl-L-carnitine might interfere with thyroid hormone. Don't use acetyl-L-carnitine if you have an under-active thyroid.

Seizures: An increase in the number or seriousness of seizures has been reported in people with a history of seizures who have used L-carnitine by mouth or by IV (intravenously). Since L-carnitine is related to acetyl-L-carnitine, there is a concern that this might also occur with acetyl-L-carnitine. If you have ever had a seizure, don't take acetyl-L-carnitine.


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Report Problems to the Food and Drug Administration

You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.


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