L-Carnitine (500mg) L-carnitine supports fat metabolism and energy production: L-carnitine is abundant in muscle tissue and the main function is to regulate fat metabolism and transport of fatty acids into the cell where they are oxidized into energy.L- mitochondrial carnitine Yes. transport long chain fatty acids to where the energy can be converted to fat cells is essential. recent studies have shown that carnitine plays stored body fat into energy for the important role and may help encourage the heart. support health of cholesterol metabolism.