Tested and proven in virtually every endurance event on the planet, Sustained Energy's unique 7:1 carbohydrate to protein ratio, and its neutral flavor, is still the first choice of thousands of athletes. After about two hours of exercise you need to have some protein in your fuel or you will start to cannibalize or break down precious muscle tissue. So when your exercise goes beyond the range of Hammer Gel or HEED alone, Sustained Energy is ready to serve you, providing premium fuel complemented with specific nutrients that support enhanced fat utilization and lactic acid buffering.