I just got 400 IUS of this stuff, I tried a kit already and like the results. I actually think that it is more potent than Jintropin, my hands hurt and my jaw hurts more. I had a kit of Jin and I tore some of the labels off to get a clear view of the lypholized powder inside. I compared them to the generic 10iu vials, there seemed to be quited a bit more powder in the generic than in the Jin, almost as if the Jins are underdosed or the generics are overdosed. They just changed the vial size, from 10ius to 8ius and they upped the price a little, still a really good deal