Unless you complement your carbohydrate source with protein, your body will start to digest its own muscle tissue (for protein) for energy after about 90 minutes of hard exercise. When your training takes you beyond the range of Hammer Gel alone, you can rely on Sustained Energy with its 7:1 carbohydrate to protein ratio. Sustained Energy contains a superior blend of complex carbohydrates, a precise amount of GMO-free protein, and a few carefully selected micronutrients that all work synergistically to provide consistent, long-lasting energy. With Sustained Energy, you'll have 100% confidence in your fuel, even during your longest and hardest training sessions and races. Without any added flavoring or sweeteners, it has a pleasant neutral flavor.