The Nitra flex pre-training formula contains ingredients that in vitro, animal and clinical studies suggest possess properties that may help advanced athletes maximize energy, intensity, vascularity and reactive hyperemia (pumps) during their workouts, and provide long-term support of testosterone and nitric oxide levels in the healthy range when used as directed. Unique properties of some of the key compounds in Nitra flex: 1-scoop potency: Nitra flex is so potent, only 1 scoop (1 serving) is necessary. High citrulline: arginine ratio: arginine is a proven precursor in nitric oxide (no), a vasodilator. What most people don"t know is that arginine supplementation stimulates the activity of anginas, an enzyme that breaks down arginine. Over time, this may actually result in reduced arginine and no levels in turn causing your pre-workout formula to stop working. Research suggests that supplementing with a high ration of citrulline to arginine may reduce this risk by avoiding overstimulation of anginas. 6 weeks of testosterone: calcium fructopyranose borate (CFB) has been shown to increase testosterone in health subjects. The average increase in total and free testosterone in a 6-week study was 56% and 29.5% respectively. In a second study, total and free testosterone increased on 3 hours after a single dose of CFB. Effective doses of beta-alanine: the clinically-proven performance enhancer beta-alanine was not "fairy dusted" in this formula. Rather, we added an exceptionally powerful does that you will feel working following your very first serving. Creatine-free: creatine causes water retention, which can make achieving a dry, hard muscular look even more difficult. Sometimes creatine is added to products precisely for this reason.