Gu Gel Box of 24GU Energy Gel provides athletes with a dose of 100 calories to deliver high quality, easily digested and long lasting energy for athletes in every sport and at all levels. Everything inside each packet of GU is engineered to do one simple thing: provide your body with the essential nutrition it needs to keep going for miles and miles and hours and hours. It goes down easy, and it goes to work fast so you don't have to slow down. What's in it?