GU Energy - GU Energy Gel with Caffeine Chocolate Outrage 1.1 oz. GU Energy Gel is simple to take and simple to digest. GU Energy Gel provides just what you need for premium exercise fuel and none of the extras that slow you down. GU takes you where you want to go, fast. The world"s first energy gel is still the most efficient source of premium fuel available to athletes today. The original idea behind GU was to find the quickest way to deliver an appropriate amount of calories to an athlete during competition without upsetting his or her stomach. Since then, the formula has been tweaked and upgraded to take advantage of feedback from GU"s elite athletes and the latest scientific discoveries. In addition to supplying the body with high-quality calories and electrolytes to keep it going, GU mitigates the energy-sapping effects of lactic-acid build-up, optimizes energy production, aids recovery by replenishing muscle glycogen stores and allows for greater mental focus through delayed onset of fatigue signals from the central nervous system. Yep, that"s all in one packet of GU. GU Sports GU Energy Gel Chocolate Outrage is specifically formulated to energize your body during exercise. Using GU during your regular workouts will keep your mind alert and active, and your muscles going strong. GU gives the most concentrated form of immediate energy with no stomach bulk or distress, is quickly and efficiently absorbed, and will maintain your blood sugar at the optimal level for a great workout start to finish.During a workout or race, no matter what type, you need to quickly absorb carbohydrate-based calories to replace the glucose you are burning at 400 - 600 per hour or you will begin to lose concentration and energy. The fat, fiber and protein found in bars are very slow to absorb and create unwanted bulk in the stomach.