Take GU's Electrolyte Brew Tablets along and you'll always have energy close at hand. They're effervescent tablets that dissolve in water. The fact is, when you work out you sweat more than just water. So when you drink, it's essential to have a special Brew with the right amounts of electrolytes to bring your system back into balance. And not only does it help boost your workouts, GU Brew Tablets taste great, too!