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. Disorders of mitochondrial long chain fatty acid oxidation and the carnitine shuttle Reviews in Endocrine and Metabolic Disorders Springer Nature Link Solved Fatty acid oxidation occurs in the mitochondrial Chegg.com Improving diagnosis of mitochondrial fatty acid oxidation disorders European Journal of Human Genetics Carnitine: Genetic Variants Affecting Mitochondrial Energy and Health