Carnitine: Genetic Variants Affecting Mitochondrial Energy and Health L carnitine Transports Fat Molecules into the Mitochondria Stock Vector Illustration of isolated, energy: 89260659 L Carnitine is Underrated. New Meta Review Reminds Us Why. 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.