Go longer and stronger with Nuun Endurance. Designed using the latest in sports hydration research, Nuun Endurance contains the optimal blend of carbohydrates and electrolytes for the unique physiological demands of intense workouts. If you’re pushing yourself to the limit or exercising for more than 90 minutes at a time, Nuun Endurance hydrates while minimizing GI distress so you can make every step and every rep count. Disclaimer: ** Electrolyte levels based on the ratio of Sodium, Chloride, Potassium in our products. See Nuun's website for more details.