Yeah, I'd like to see the study that came from too. And why would you want to take 12iu anyways? Read what I said up top. If you're using gh for mass, 15-18iu/day. You can use a lower dose if you want, but be prepared to throw your money away result wise. Gh is expensive, so trust me when I say that if 10-12iu would add mass like you need it to, then that's the dose they would prescribe it at.