Tasty, Portable Energy for AthletesGU Original Energy Gels pack quick, effective, and sustained energy to meet the demands of all types of activity, in a convenient packet small enough to fit in your pocket.Original Energy Gels contain carbohydrates for energy, electrolytes for hydration, and BCAAs to help protect working muscles. Learn more about each. Fast-acting and long-lasting carbohydrates - from maltodextrin and fructose - allow you to quickly digest more fuel without stomach upset. Our gels contain sodium, the electrolyte you lose when you sweat. Always take gels with a few sips of water to help your body efficiently absorb your fuel.