NOxygen by Purus Labs Pre-Workout Accelerator Stimulant-Free Blood Flow & Oxygen Amplifier! NOxygen is a novel stimulant-free pre-workout additive designed to create an oxygen-sparing environment through enhancing vasodilation and blood flow with Nitratene, while simultaneously volumizing muscle cells and increasing lean body body mass (LBM) with HydroMax water soluble glycerine. Yet another industry-first for Purus Labs, NOxygen is perfect for both strength and endurance athletes. * Oxygen Sparing * Increases Blood Delivery * Enhances Muscle Volume * Stim-Free Additive