Weider L-Carnitine Drink 500ml No calories Sugar-free Aspartame-free No preservatives The new L-Carnitine Water contains zero calories and is free of sugar, dyes or preservatives. Weider has added additional choline to support fat metabolism. L-Carnitine is a molecule necessary for transporting fatty acids into the mitochondria, where fat is converted into energy. These function as the bodys boilers where fat is burned and energy is produced. L-Carnitine is useful in intensive endurance training because it promotes the extraction of energy from fat, preserving all glycogen reserves and making training more effective.