L Carnitine 500 Tabs 60 Optimum Nutrition L Carnitine 500 Optimum Nutrition Weight Loss 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 Optimum Nutrition Superior Amino 2222 Tablets, Essential Amino Acids, 160 Count Essential L Carnitine Optimal Health Systems L Carnitine Optimum Nutrition OZON