L Carnitine Explained: What This Amino Acid Does for Your Body L Carnitine Amino Acids Walgreens L carnitine for metabolism Lifehack 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, Amino Acid, Mixed Berry, 3,000 mg, 16 oz (473 ml) Acetyl L Carnitine 500mg Amino Acid Supplement Nature's Best