GU Gel (Salted Caramel) [WITH CAFFEINE] has been designed to fuel athletes during exercise and assist in speeding recovery. It's the world's first energy gel and to this day still remains as one of the most efficient. Designed for daily endurance sports and training, however GU can be used at anytime to fuel a workout. The pack itself contains 100 calories which is made up of predominantly (70-80%) complex carbohydrates, allowing to fuel energy demands during exercise. It also replenishes sodium that is commonly lost through the process of sweating.