Nitrix is vaso-muscular dilator. So, basically what it does is help increase the blood flow to your muscles allowing more oxygen and fuel to be delivered to them when you need it most. Even after the first time I used nitrix, I felt like I had more energy. My muscles had more endurance and it seemed like it took a lot more work before fatigue started to settle in. It’s really helped me take my training to the next level and allowed me to push myself further than I have ever been before. I’ve also noticed that my joints aren’t as stiff and sore as they used to be. It’s a Grade-A product.