Replenish yoursef after even the most exhausting workout with the Nuun Sport + Caffeine Tablet. With just 15 calories and 1 gram of sugar per tablet, you don't have to worry about enjoying a delicious drink, and 300 mg of sodium will restock your body will all of the electrolytes it lost. Simply pop a tablet into your water bottle, and feel the power return to you. Now with caffeine for even more of an energy boost.