Science in Sport, leaders in sports nutrition, introduce the world's first isotonic energy gel. Each handy palm size GO Gel sachet contains 25g of isotonic carbohydrate energy. That's enough energy for 20 to 30 minutes of exercise, and because it's isotonic, it will still deliver energy without the need for extra water. What's more the unique gel structure of GO Gel goes down easily, so you don't get that sticky throat feeling associated with other gels.