Proprietary Blend. Delicious and refreshing! To energize your day! 0 Calories! 0 Fat! 0 Carbs! 0 Sugar! All energy! Naturally and artificially flavored. TwinLabs Energy Fuel Carbonated Drink is not only full of fantastic fruit flavor, but it helps you get the extra energy you need for your demanding high performance lifestyle. This herbal formula provides thirst-quenching fuel for when you start to run out of energy. Twin Labs here to help fuel you with EXTRA ENERGY!