What is L carnitine? Reducing fatigue Life Extension Europe 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 MCT oil is a supplement made from a type of fat called medium chain triglycerides. MCT molecules are smaller than those in most of the fats you eat, which are long chain triglycerides (LCT). Nature's Answer Liquid Carnitine Dietary Supplement, 16 fl oz Kroger