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What's in GU Energy Gel? GU's ingredients fall into 3 categories. For energy, you a get a blend of simple and complex carbs, plus a shot of caffeine and electrolytes to max out energy production at the cellular level. For endurance, GU gives you complex carbs from maltodextrin plus mineral citrates (potassium citrate, sodium citrate and citric acid) to help reduce acid build-up in muscles. Branched chain amino acids (BCAAs) serve as a vital fuel source during extreme exertion; they also aid in recovery .