Bluetops (actually they can be any color) are the generic brand, I would guess most of them come from IP... In theory they all should be the same, but I guess it depends on how they are handled. I know that if you store them right, in fridge at right temp. Hgh can have a shelf life of about 2 years. And stored in roomtemp, they are good for abut a month... So if you have your hands on some HgH from China, that took like 2 weeks to ship to the US or EU. Then quality might be a little off...
Maybe that is why ppl keep talking about that HgH from US is "stronger" (if you are from the US), or the EU brands is perceived as stronger if you live in the EU.
I've heard that people solve this problem of "weak" HgH by upping their dose.
I've been on HgH for about 5 months now, started with 4iu every day with Hygetropin, I didnt get the results I was expecting. I did have some fatloss, but from what I've seen I should have been expecting a little more. I have about 300iu of IP bluetops and 200iu of Lily left, which I expect much more from, since they are produced later.