L-Carnitine
In this Article
- What other names is L-carnitine known by?
- What is L-carnitine?
- How does L-carnitine work?
- Are there safety concerns?
- Are there any interactions with medications?
- Dosing considerations for L-carnitine.
How does L-carnitine work?
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?
L-carnitine is safe for most people when taken by mouth. It is also safe when used as an injection, with the approval of a healthcare provider. It can cause side effects such as nausea, vomiting, stomach upset, heartburn, diarrhea, and seizures. It can also cause a "fishy" odor of the urine, breath, and sweat.L-carnitine seems to be safe when used appropriately, short-term in children.
L-carnitine seems safe for most breast-feeding women when taken in the amounts recommended. The effects of large doses taken by a breast-feeding mother are unknown.
Do not take L-carnitine if:
- You are pregnant.
- You have seizures or a history of seizures.
- You have thyroid problems.

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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