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. Pyruvate supported flux through medium chain ketothiolase promotes mitochondrial lipid tolerance in cardiac and skeletal muscles: Cell Metabolism Metabolism: The carnitine shuttle and fatty acid metabolism (practice) Khan Academy Carnitine shuttle system for fatty acid oxidation. Carnitine Download Scientific Diagram