I don't want to get bashed so I won't tell you how many IUs you need for real fast dramatic results. Just a hint, take a look at medical researches made on GH or IGF-1. You might be surprised to find some really high dosages were used in research. And some pretty "considered high" dosages are used in aids patients.
If you could make an hypothetican analogy to testosterone, you would find that dosage wise. Being that about 1iu is considered a light anti-aging dosage, you will find that 1IU of GH a day is analogical to taking 100mg of testosterone every 10 days (which is what some endo HRT doctors prescribe).
Do you know of any bodybuilder that takes 100mg of test every 10 days for muscle building purposes? I personally don't, simply because that will only bring a guy to his upper level in scale of normal test production for male. I find not reason to take 1iu of GH a day, unless you're my grandma.. (and i think i would have given here 2iu.. lol)
I'll quote some medical research if I find them somewhere in my huge archive.