Life Extension L Carnitine, 500 mg Energy Supplement, Metabolism and Memory Support, 30 Vegetarian Capsules Walmart.com L Carnitine 500mg 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 Liquid Force Factor Amazon.com: Seeking Health Acetyl L Carnitine Acetyl L Carnitine Supplement Supports Energy, Healthy Fat Metabolism, & Memory Health 500 mg, 90 Capsules : Health & Household