i've done no2 and just mass amounts of arginine.. and got great pumps from both (didnt notice a difference).. and the plain arginine is much cheaper! never tried nox3
No, I got mine from where I work. It will run you anywhere between $50-65 and I have no idea if GNC carries it. I can't remember any specific weight gains I made but I can tell you that it upped my focus and drive in the weightroom.