NOX2 is a very dangerous supplement. Not long ago I read an article about its dangers. It expands your blood cells for no reason, which to the brain is extremely unordinary and abnormal, so it triggers a panicked reaction in your brain and it thinks your body is going into shock and tries to counteract the measure. It can be very harmful, and you should try a search for the article on the internet, I may have read it over at BB.com. Definitely steer clear of it.
Edit:
There is one positive side effect. In the body there is a nitric oxide receptor responsible for controlling ejaculatory strength and volume of liquid ejaculated, and several users report harder ejaculations and more ejaculate. I guess that's kinda of uhh neat, but really not something I'm willing to **** my brain up for.