Nuun have taken their electrolyte tablets and boosted them with caffeine and B vitamins. Like all their products these Energy tablets contain essential electrolytes to replace those lost in sweat but they also have something else in store. In each tablet you get 40 mg of caffeine sourced from green tea extract approximately the same as 12 cup of coffee providing a boost for your body and mind plus a complement of B vitamins which are essential for the conversion of carbohydrates into energy. With their clean refreshing flavors these are an enjoyable way to hydrate and energize up during your next ride.