History of L carnitine: Implications for renal disease Journal of Renal Nutrition Carnitine, Acylcarnitines and Beta Oxidation Lipolysis Fatty Acid Oxidation and Ketone Bodies The Medical Biochemistry Page Carnitine: Genetic Variants Affecting Mitochondrial Energy and Health L Carnitine helps shuttle fatty acids into the mitochondria (the power plants of your cells) where they can be burned for energy. It's often used in fat metabolism and energy support formulas.