Ironflex Arginine is a dietary supplement that helps increase nitric oxide, thus improving blood flow to muscles during training. Arginine significantly increases training efficiency, allowing muscles to better assimilate nutrients and increase endurance. Ironflex Arginine has superior properties to the free form of arginine and is ideal for both beginners and professionals. Dosage: Take 3-5g before training in 200ml of water. On rest days, take a 3g dose before bed.