L Carnitine vs L Arginine: Understanding Their Differences and Benefit Fitness Health L Carnitine Benefits, Uses, Dosage, Foods, Side Effects Dr. Axe 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 PRO ZERO 500 MILLILITER BOTTLE ERIC FAVRE L Carnitine plays an important role in the larger metabolism equation: helping your body use fat efficiently as fuel. Learn more about the science on this week's post on The Wellness Edit.