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If you're not a fan of pre-workouts containing stimulants, then we have just the product for you.Meet Pump Serum – our powerful stim-free pre-workout supplement formulated to optimize pump, muscle fullness, training capacity, and focus.Pump Serum combines 13 potent and some patented ingredients to intensify your workout performance. Each compound is dosed optimally for maximum effect, which is why each serving is over 31 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.