Hi Dr Preeti, thank you for reading and providing valuable feedback. You cannot buy nitric oxide as a supplement. The body creattes it from other nutrients and exercise. So you may need to supplement with Arginine or Citrulline if your diet is deficient in these nutrietns. Believing you eat lots of green vegetables like arugula and spinach you might be getting it from your diet. I also believe that you do lots of exercise. I wish you the best in your health and fitness journey.