L Carnitine Explained: What This Amino Acid Does for Your Body L Carnitine Benefits, Uses, Dosage, Foods, Side Effects Dr. Axe L Carnitine Benefits for Chronic Fatigue Syndrome 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: Health Benefits, Side Effects, Uses, Dose & Precautions