Since I have been on NO2, my concetration has not decreased; possibly increased. No muscle pain, quick recovery, small strenght gains, and fat loss. The big one is that my joints feel better than they have in a long time. I have back and neck problems where I need to see a chiropractor twice a week to keep everything in line. My back and neck have been doing great and I feel much more flexable all the time. Maybe its all in my head???

Hey, I TOTALLY agree. I keep hearing all of these people dissin NO2s muscle effects. I had pretty much the same results as you. I blew up like a freakin balloon. Then The third week when I got on creatine it was unbelievable. People were asking me if I was on steroids. I believe the NO2 does provide you with some extra joint lubrication while you are on it because I have had a rotator cuff prob for about 3 years and I couldn't even feel it when I was on NO2 and creatine and the pumps were unbelievable. However if you read a couple posts up, one guy explained how the stuff works. IT seems to work through the Alpha ketoglutaric acid. Not the arginine. I have been taking arginine for a long time and it works a little bit for me, but not at all like this stuff. To sum that post up there up a little bit (I might do a bad job so go ahead and read that one) Alpha ketoglutaric acid converts fairly easy into glutamate. Which in reasonable numbers is actually quite necessary, however it is pretty hard to get a deficiency in the stuff and too much can start to wipe out your cells. I havent read it in a while but I believe what glutamate does is allow stuff into your cells better, which is okay if it is done in moderation. But when you start messing with the stuff by taking exogeneous compounds like NO2, you can leave the door into your cells open too long, allowing too much of certain things in, which destroys the cells. Do some research on monosodium glutamate and you'll know what I'm talking about. Thats brain destroyer food (the brain is where you have the most glutamate I believe.
But I am with you. I had good results and am not saying don't take it. Just be REALLY sure because there is very little research into the effects of alpha keto glutaric acid supplementation in humans. We don't really know the side effects and side effects arent good. A lot of people figure they will just take it and see what happens because it works. But pretty much every single steroid you can take WORKS but you don't see everybody jumping onboard and taking those. It's almost as though because we can buy something at GNC, its GOTTA be safe, but this is not necessarily the case.

Sorry for the big long speach there, just check it out thoroughly.
Cody