Also sold as L-carnitine, acetyl-L-carnitine, ALCAR
Meaningful mainly in vegetarian diets, dialysis, or documented deficiency.
TrustedSupp Tier System™ · Tier 2Take until levels correct
Check before you startThis one has documented interactions with medication classes where the consequences are serious. If you take any prescription medicine, run it past a pharmacist before starting.
Evidence strength
40/100Limited
WEAKLIMITEDMODERATESTRONGVERY STRONG
What the evidence supports: correcting deficiency; performance claims are weak.
This scores how well-supported the claim above is — not how much benefit you personally would get. A high score on a narrow claim does not extend to everything the product is marketed for.
How long to take it
Course-based unless treating a documented deficiency.
Who it's actually for
Vegetarians, dialysis patients, and specific metabolic conditions.
Safe upper limit
Unverified
No formal limit; 2 g daily is typical
Gut bacteria convert it to TMAO, which some studies associate with cardiovascular risk. Causes a fishy body odour at high doses.