4C Energy Rush with Taurine Variety Pack Drink Mix 4.98 oz Box 18 Packet Box Expiration Date Always Fresh C Energy Rush is lightly carbonated, vitamin B enhanced, increases concentration, improves performance and stimulates the metabolism without the sugar crash. 6 of each flavor: 4C, Sugar Free Energy Rush Berry. 4C, Sugar Free Energy Rush Strawberry. 4C, Sugar Free Energy Rush Orange. Only 5 calories per serving.