What it is
L-carnitine is made in the body from the amino acids lysine and methionine and is also found in red meat. Most adults make enough on their own.
How it works
It carries long-chain fatty acids across the inner mitochondrial membrane so they can be burned for energy, and helps remove excess acyl groups from cells.
What the research shows
- Levocarnitine treats primary and secondary carnitine deficiency, including in people on dialysis.
- Trials for weight loss and exercise performance show small or inconsistent effects.
Regulatory status
Levocarnitine (Carnitor) is FDA-approved for carnitine deficiency. L-carnitine is also sold as a dietary supplement.
Storage and handling
Usually supplied as a ready-made solution. Store as labeled at room temperature.
Key references
- NIH Office of Dietary Supplements. Carnitine fact sheet for health professionals.
- Search PubMed for L-Carnitine studies
- Official drug labeling on DailyMed
Peptide Knowledge is an educational reference. Nothing on this site is medical advice, a treatment recommendation or dosing guidance. Many compounds described here are not approved for human use and are sold for laboratory research only. Talk to a licensed clinician before starting, stopping or changing any medication or supplement.
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Related reading: reconstitution guide · how to read a certificate of analysis