Nuun Hydration Sport is an effervescent tablet that dissolves in your water and provides replenishment of minerals lost during exercise. Nuun's proprietary blend of electrolytes was designed for optimal hydration.Nuun Electrolytes utilizes the best in sports nutrition science to provide active individuals with the right amount of minerals, carbs and vitamins. This perfect balance of minerals delivers efficient re-hydration and energy to athletes before, during and after workouts.