USN Spike Sugar Free 250ml. Spike Sugar Free is an energy drink formulated to enhance mental & physical performance by combining effective ingredients that when combined have a positive effect on human physical performance. Spike has been formulated to enhance mental & physical performance. This effect is accomplished by the combination of caffeine, along with the supportive ingredients guarana & inositol. Research suggests that caffeine has a positive effects on human muscular endurance & mental focus. Physical exertion lowers the body’s taurine reserves. Additional taurine supplementation may therefore support fatigue resistance by replenishing the body’s taurine supply. Added B vitamins further support the energetic mechanisms of the body. • Enhances mental focus & muscular performance• Sugar free energy booster• Supported by taurine & inositol• With added B vitamins to support the body’s metabolism