Maximising Your Pump: The Science

Chasing the pump is more than just an aesthetic pursuit. Increased blood flow to working muscles delivers more oxygen, nutrients, and amino acids, supporting both performance during your session and recovery afterwards. The best pump pre workouts use research-backed vasodilators at clinical doses to maximise nitric oxide production and muscle volumisation.

Our pump rankings focus on the ingredients that matter most: L-citrulline at 6g or above, GlycerPump for cell hydration, betaine for power output, and newer compounds like Nitrosigine and S7. We test each product specifically during high-volume hypertrophy sessions where pump quality is most noticeable.

Many of the best pump pre workouts are stimulant-free, making them ideal for stacking with a caffeinated product or using during evening sessions. See how the top two products compare in our Ghost Pump V2 vs Transparent Labs PUMP comparison, or browse our stim-free rankings for more caffeine-free options.