GU Original Energy Gels, Bestsellers Mixed 24 PackGU Original Sports Nutrition Energy Gel is the energy gel that started it all. In 1993, Dr. Bill Vaughn developed the world's first energy gel to help his daughter perform better in ultramarathons, and since then, GU has helped drive the world's most successful extreme athletes to success. The GU Energy Gel supports all forms of sports activity with a highly compact, portable and calorie tight package filled with carbohydrates that can be absorbed