L-Carnitine
Mechanism.
L-Carnitine is a naturally occurring amino acid derivative synthesized from lysine and methionine, primarily in the liver and kidneys. Its primary biological role is transporting long-chain fatty acids into mitochondria for beta-oxidation (fat burning). L-Carnitine is available in several forms including L-carnitine tartrate, acetyl-L-carnitine (ALCAR), and propionyl-L-carnitine, each with somewhat different clinical applications. It is well-studied with decades of clinical data.
L-Carnitine works like a ferry service that carries fat molecules across the mitochondrial membrane — the wall surrounding your cell's power plant. Without enough ferries, fat piles up on one side and can't be burned for energy, no matter how much exercise you do.
How it's taken.
Values below describe how L-Carnitine has been administered in published trials and labeling. Provided for educational purposes only — this is not medical advice and not instructions for self-administration. Consult your healthcare provider before making any health decision.
FDA-approved prescription form (Carnitor/levocarnitine) for carnitine deficiency. OTC supplement forms widely available. Acetyl-L-carnitine preferred for cognitive effects, L-carnitine L-tartrate for exercise performance.
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Side effects, rare serious events, who shouldn't.
How strong is the evidence?
Scores derived from rating, indexed studies, regulatory status, and catalogued safety data for this peptide. Curated per-peptide scoring replaces this when available.
Every study we cite.
Each study with its published finding and a plain-language note on limitations or funding.