Longevity & Mitochondrial

L-Carnitine / Acetyl-L-Carnitine

Also known as L-Carnitine · Acetyl-L-carnitine · ALCAR · Levocarnitine · L-carnitine L-tartrate

Emerging researchOralIntravenousAvailable as a dietary supplement; prescription levocarnitine (Carnitor) is FDA-approved for primary and certain secondary carnitine deficiencies

L-carnitine is an amino-acid-derived compound that transports long-chain fatty acids into the mitochondria for beta-oxidation, supporting energy production. The acetylated form, acetyl-L-carnitine (ALCAR), crosses into the brain and is studied in the context of cognitive aging. Evidence for weight, exercise, heart, and cognitive benefits is mixed. One consideration noted in research is that supplementation can raise blood levels of TMAO, a gut-derived metabolite linked in some studies to cardiovascular risk.

Studied / used for

Studied for mitochondrial fatty acid transport and energy metabolism
Researched in the context of age-related cognitive decline (acetyl form)
Studied for exercise performance and recovery
Researched in the context of heart health and type 2 diabetes

Commonly reported side effects

Heartburn
Indigestion
Nausea
Diarrhea
Fishy body odor reported at higher intakes
Elevated TMAO levels (a cardiovascular-risk consideration)

Emerging research. Active research; human evidence still developing. This reflects the strength of the research base, not effectiveness or a recommendation.

Not medical advice.

This is an educational reference. Peptalk does not recommend, prescribe, endorse, or rate any compound, and provides no dosing information. Do not start, stop, or change any peptide, hormone, supplement, or therapy based on this page. All clinical decisions must be made with your licensed healthcare provider.

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