GU provides athletes with a shot of 100 calories in the form of a patented carbohydrate blend (70%-80% maltodextrin and 30-20% fructose) to deliver high-quality, easily-digested and long-lasting energy for athletes in every sport and at all levels. GU also includes electrolytes to ensure proper hydration, an antioxidant blend to stave off muscle tissue damage and an amino acid blend to delay muscle fatigue. Everything inside each packet of GU is engineered to do one simple thing: provide your body with the essential requirements 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. Specifications: Comprised of 85% complex carbs and 15% simple sugars isoleucine Contains histidine which buffers lactic acid accumulation and valine Over 100% of daily allowances of vitamins C and E in every serving Formulated with all 3 branched-chain amino acids (BCAAs): leucine