GU Original Sports Nutrition Energy Gel is the energy gel that started it all. In 1993, Dr. Bill Vaughn developed the worldâs first energy gel to help his daughter perform better during ultra-marathons, and GU has been helping to propel the worldâs most successful extreme athletes to success ever since. GU Energy Gel sustains all forms of athletic activity with a highly compact, portable, and calorie-dense packet that is loaded with carbohydrates that can be rapidly absorbed. Branched-chain amino...