L Lysine Woodlands Institute for Health & Wellness L Carnitine Benefits, Uses, Dosage, Foods, Side Effects Dr. Axe L Carnitine: Benefits, Uses, Side Effects, and More 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 Doctor's Best Acetyl L Carnitine, 500 mg, 60 Veggie Caps