What is L Carnitine? L Carnitine is a naturally occurring amino acid derivative that the human body can synthesize itself. It is mainly found in red meat and dairy products. [1] Core Benefits of 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 Nature's Answer Liquid Carnitine Dietary Supplement, 16 fl oz Ralphs Acetyl L Carnitine Vegetarian Capsules Natural Factors USA Contraindicaciones de la L Carnitina Aldous Bio How L Carnitine Helps with Fat Metabolism