Supplements & Remedies Andrew Weil, M.D. 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 Study links depression to low blood levels of acetyl L carnitine L Carnitine Fumarate with Biosint Carnitine, 60 Veggie Caps (500 mg per Veggie Cap) L Carnitine