GU Brew Electrolyte Drink Tablets LemonLime - 2 Tubes of 12 Tabs Each ! GU Brew Electrolyte Drink Tablets LemonLime - 2 Tubes of 12 Tabs Each ! GU Brew Electrolyte Tablets have the key electrolytes needed to stay hydrated before, during, and after exercise, without any extra calories. Simple, light taste with natural ingredients & natural sweetener - Stevia ! 320mg Sodium, 55mg Potassium and only 10 calories per tablet ! Each tablet makes a 16oz drink - Each tube makes 12 drinks !