I'm not sure what it is, but I've took alot of supplements, and none of them compared to this, this stuff got me extra lean, I didn't put on much weight, but I got cut up, and at the time I was taking it I had a terrible meal plan, so if I would have been eating alot of cals it may have gave me size also. It asks for a month layoff after a three month stretch, and I've always heard that when you do gear, that you lose size , but keep your strength once you complete the cycle, and let your body recoop. Well when I took the layoff my body went down a little bit, but my strength stayed the same. I had a feeling that it wasn't real, but when it did better than anything I ever used, I had to post it to see what you thought. I hope I didn't break any rules by posting the pic. I know some people on here think I'm an idiot for using this stuff, but I've never had the real deal, so I wasn't sure about this stuff. Thanks for your input.