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 What Is CoQ10 and L Carnitine, and How Can It Change Your Life? iThrive Essentials Basix L Carnitine 3500 Liquid & Green Tea Extreme Nutritions L Carnitine Benefits, Uses, Dosage, Foods, Side Effects Dr. Axe