Created for athletes whose focus is on hydration, GU Hydration Drink Mix is formulated with a blend of electrolytes and carbohydrates, providing a light-tasting and rapidly absorbing hydration drink. Sodium, the primary electrolyte lost in sweat, aids hydration by maintaining water balance. This 70-calorie serving of GU Hydration Drink Mix contains carbohydrates (maltodextrin and fructose) that use non-competing pathways to help maximize carbohydrate absorption and utilization while diminishing stomach distress. Also Known as GU Brew.