How L Carnitine Benefits Your Body and Mind L Carnitine: Benefits, Side Effects, Sources, and Dosage iMuscles Nutrition L Carnitine: Benefits & Supplementation Integrated Mobile 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 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 Carnitine: the claims and why it may not work