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Meet Pump Serum our powerful stim-free pre-workout supplement formulated to optimize pump muscle fullness training capacity and focus. This pre-workout is caffeine free so that it will give you no crash feeling afterward. Pump Serum combines13 potent and some patented ingredients tointensify your workout performance. Each compound is dosed optimally for maximum effect which is why each serving is over31 grams. You can experience great high-intensity workouts without having to worry about a crash afterward. Using Pump Serum is simple: you mix one full scoop with 8 to 12 fl oz of water or any other beverage of choice about 30 minutes before hitting the gym.