L-Carnitine Drink Zero calories Sugar-free Aspartame-free No preservatives The new L-Carnitine water contains zero calories and has no sugar, dyes or preservatives. It also includes choline, which supports fat metabolism. What is L-Carnitine? L-Carnitine is a molecule necessary for transporting fatty acids into the mitochondria, where fat is converted into energy. They function as the bodys boilers where fat is burned and energy is produced. In addition to helping with weight loss, L-Carnitine is useful in intensive endurance training because it promotes the extraction of energy from fat, preserving all glycogen reserves and making workouts more effective.