Carnitine and acetyl L carnitine Neuroneeds L Carnitine Side Effects & Safety: A Complete Guide The Science of Good Health What is carnitine? Carnitine is produced in the body from the amino acid lysine and naturally occurs in some foods. It supports energy metabolism and muscle function, which are important factors in l Carnitine Supplementation in Recovery after Exercise The bright and the dark sides of L carnitine supplementation: a systematic review Journal of the International Society of Sports Nutrition Springer Nature Link