Our Pump Stim Free supplement is banned substance tested and is manufactured in a GMP (Good Manufacturing Practice) compliant facility. We care about the products you put into your body. Build lean muscle muscle mass as you take your workouts to the next level while increg your strength. This formula will help you get focused and stay focused so you can concentrate on your workout for optimum performance. Provides increased energy for maximum output during your workout helping you reach your goals. Pump helps build stronger, leaner muscles and helps you maintain high energy pre and post workouts. Pump helps build stronger, leaner muscles and helps you maintain high energy pre and post workouts.