Power-C is a berry flavored Vitamin Water from Glaceau. Featuring the flavor of dragonfruit, this beverage has been enhanced with Vitamin C and taurine (an amino acid, most famous for its use in energy drinks). The flavor has a very light berry taste with a slightly bitter finish. The bitterness was a bit of an issue for us, but overall, it’s a nice low calorie beverage that will give you a boost when you need it.