Nitraflex Pre-WorkoutHyperemia & Testosterone Enhancing Pre-Training Formula NITRAFLEX will have you conquering the weights with screaming muscle energy and testosterone-fueled intensity. NITRAFLEX is a clinically tested, high-intensity pre-training formula containing high intensity ingredients that help magnify your energy, alertness, strength, stamina, pumps, and testosterone during workouts. Ideal for hard-training athletes, especially those who feel that they may have hit a training...