TweetNO2 sucks in my opinion, it is just a hemodilator. I never got the pumps from it like some have claimed. Creatine on the other hand works very well for me and I have way better workouts on it. Don't buy into all the celltech and stuff like that (unless you like that stuff) it is just creatine and sugar. I just throw mine in some juice and down it. It will swell you up a little (water wieght) but the pumps are worth it IMO. Just my 2 cents. Good luck bro!
Oh yeah no steroids for you, i know you know ...lol