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 is not a magic fat burner It won't melt fat, build muscle, or replace hard work. The only thing it burns is your money Stick to the basics L Carnitine L Tartrate: 8 Key Benefits Dr. Lam