Science in Sport, leaders in sports nutrition, introduce the worlds first isotonic energy gel. Each handy palm size sachet contains 25g of isotonic carbohydrate energy. Thats enough energy for 20 to 30 minutes of exercise, and because its isotonic, it will still deliver energy without the need for extra water. Whats more the unique gel structure goes down easily, so you dont get that sticky throat feeling associated with other gels. Start your race on full power. Isotonic, so no need to take with water. Easy to use and digest whilst running. Enough Energy for 20-30 mins exercise. All Science in Sport products are drug-free. Please note - SIS are going through a process of re-branding their current product range. This only means the look of the packaging has changed, not the products contains.