A freind of mine has come across persciption HGH (Genotropin) and it is not premixed you have to use a certain pen needle where the HGH is mixed when you insert the cartrige into the pen. They are telling them that the proper dose is to take his wieght in kilos and multiply by .05 and that is the proper dose. Everything that I have read on HGH the doses are in IUs. What is the difference? Is this right? Can someone help me?