Tasty and portable energy for athletes GU Original Energy Gels contain fast, effective and sustained energy to meet the demands of all types of activity, in a convenient package 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 one. Fast-acting, long-lasting carbohydrates (from maltodextrin and fructose) allow you to quickly digest more fuel without stomach upset. Our gels contain sodium, the electrolyte that is lost when sweating. Always take gels with a few sips of water to help your body absorb fuel efficiently. Our BCAA blend helps protect muscles against breakdown, contributes to energy production and helps prevent mental fatigue.