Prepare your body and mind before training and unleash Gold Standard to achieve your fitness goals. The Gold Standard Pre-workout Energy Shot from Optimum Nutrition, the world's #1 sports nutrition brand**, will help you improve your concentration*. ON Gold Standard Pre-workout is a unique shot that contains 175 mg of caffeine from natural sources per serving, sharpening your alertness and focus*** and helping you train better, harder and for longer. Each serving of this energy- drink also contains 250 mg of PerforMelon Boost, a concentrated source of the phytochemicals naturally found in watermelon. ON pre workout gym supplement is also enriched with a sage leaf and nettle root extract, plus vitamins B6 and B12, and helps to reduce tiredness and fatigue to prepare you for an even more intense workout.