Dehydration can cramp you up, elevate your heart rate, and cause headaches. Staying hydrated helps make tough workouts feel easier. GU Hydration Drink Tabs provide a boost to your water by supplementing it with electrolytes for improved performance and recovery. Each drink tab contains just 10 calories, in addition to 320 milligrams of sodium and 55 milligrams of potassium to help maintain fluid balance and delay fatigue by replacing electrolytes depleted during exercise.