nuun energy. you need a lift, nuun energy elevates your hydration. with caffeine from green tea extract, b-vitamins, and electrolytes, nuun energy helps to maintain high levels of energy. designed to give you a lift and elevate your hydration. nuun energy contains caffeine from green tea extract, b-vitamins, and our signature blend of optimal electrolytes. nuun energy contains clean ingredients, and is low in calories and sugar. with 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 active, nuun energy will also keep you hydrated and cramps at bay.