Carnitine: the claims and why it may not work Did you know L carnitine, a vital amino acid, is naturally produced by your body and found in various foods? While acetyl L carnitine (ALCAR) can be a beneficial supplement for some, most people get L Carnitine Amazon.com: NOW Foods Supplements, Acetyl L Carnitine 500 mg, Amino Acid, Brain And Nerve Cell Function*, 200 Veg Capsules : Health & Household L Carnitine Uses & Benefits Explained: A Complete Guide The Science of Good Health