Unleash Skin-Tearing Pumps with Proven Pump—Stimulant-Free Muscle Volumizer • Stimulant-free formula for clean energy and evening workouts• L-Citrulline & Arginine boost nitric oxide for intense muscle pumps• Glycerol enhances hydration and promotes extreme muscle fullness• Betaine supports strength, endurance, and reduced fatigue• Stackable with other pre-workouts for custom performance boosts Gaspari Nutrition Proven Pump is a stimulant-free liquid muscle volumizer engineered to deliver skin-stretching pumps, improved vascularity, and better hydration. This pre-workout is ideal for lifters seeking explosive fullness without caffeine. L-Citrulline and Arginine combine to supercharge nitric oxide production, pushing more blood, oxygen, and nutrients into your working muscles for next-level performance. You'll feel fuller, look more vascular, and train harder from start to finish. Glycerol works to hyper-hydrate your muscle cells, maximizing volume and endurance, while Betaine Anhydrous supports raw strength and minimizes fatigue during heavy sessions. Proven Pump is perfect for anyone training late, avoiding stimulants, or stacking with a stim-based pre. It's your go-to for pumps that don’t quit and clean gains that show.