For nearly a decade, NITRAFLEX® has been the name you trust when it comes to pre-workout formulas. And now, NITRAFLEX® ups the ante by introducing Nitrosigine® to the mix, and adding even more pure Citrulline to the formula. This 1-2 punch greatly increases pumps beyond expectations. The volume has been turned up on the energy, focus and flavor as well. All in all, this is the strongest and best-tasting NITRAFLEX® yet.