Essential L Carnitine Optimal Health Systems 500 MG OF PURE L CARNITINE, L carnitine is synthesized from the essential amino acids lysine and methionine. Because approximately 98% of the body'S L carnitine supply is found in muscle mass, and the Tablete energizante Optimum Nutrition L Carnitine, 60 Tablete eMAG.ro Optimum Nutrition (ON) L Carnitine 500 mg 60 Tablets NUTRABAY Optimum Nutrition L Carnitine Tablets L Carnitine 500 Tabs 60 Optimum Nutrition