Nuun Energy has optimal electrolytes, caffeine, and B Vitamins. Nuun Energy keeps you hydrated and gives you a boost when you need it most. The caffeine helps to give your energy a lift, and B Vitamins help your body to metabolize fuel efficiently & to keep energy high with the same optimal electrolyte level you know and trust from Nuun. Nuun Energy will also keep you hydrated and cramps at bay. Each lightweight tube holds 10 tabs and makes 1.5 gallons (16 oz. per tablet). Gluten free & vegan.