NO2 worked awesome 4 me, and i'm on my third go round I started noticeing the pumps in the gym right away and after a few days the huge all day pumps not to mention looking pumped and cut all the time, on my 1st time around I gained 10 lbs as well as another 10 lbs the second time around. I started out as a scrawney 175lbs and am now tipping the scales at 200 and the muscle stays on, as iv'e cycled on & off and have never used anything but NO2 and protien. i'm convinced its the next best thing to steroids! But buy the book it's well worth it, NO2No2 is the best investment you can make to your body. If your not willing to spend the extra 63 bucks then your not serious enough about being a better athlete/competetor. p.s. I run collegiate track and play basketball and it's made me faster and stronger!

First thing, I knew this stuff was the "original". I said, its gotta be good. I took my first dosage and my arms we're pumped like a car tire soon as I started lifting. I took for 2-3 weeks. I cant say I felt the pump for all 2-3 weeks. Now every once and while I take a dosage to see if I get that huge pump, and I havn't. I am curious to as of why. I would say the first week though it exploded in me. Then it toned down.I rate it nuetral. I wont say its crap because I am one of millions. Each of us are uniquely designed and act different to things we consume(hence: some of us genetically build muscle quicker then others).

I used MRI No2 for about a month, long enough for me figure out that I don't respond to it much/it's overhyped. It's more money than the other brands too, because it's 'the original'.  
   
 I took it morning and afternoon as directed and made sure I got enough water. I didn't get any noticable muscle pump or strength gains as promised. So basically, it's crap. I definitely recovered better though, like I would have virtually no soreness after some workouts.  
   
 Overall, it's a $50 bottle of garbage. If you need improved recovery, get some endurox or something.

I started taking this product about three years ago when it was somewhat new to the industry. I was 170LBS 6'1" and just threw it in with my normal eating habits and intake of protien. I continued my normal workout regimine. After a couple weeks i noticed veins in my shoulders and my pumps felt enormous.I Most likely was'nt a whole lot bigger but my skin was tighter and my pumps were lasting extra long. I was'nt much for traditional bench. I prefer dumb bell bench but a couple of my bigger buddies kept tryinig to pull me over to the flat bench for a max competition. I gave in and just threw on my previous max of 245 and it went up like a feather, then on to 260 and again with ease. I continued in aw up to 300lbs and prolly could have done more if i hadn't wasted my energy on the lesser weights. Everyone was pretty suprised especially myself. I noticed all muscle groups had gone up in strength dramatically. Downside is as soon as you quit taking it, you lose a lot. Its great for summer on the beach though!