2 iu of Huma or Geno will give you great results. Will 4 iu be better, yes. I've never gone over 4iu of any pharm GH, usually do 3 iu with great results. You do not need much with legit pharm grade products. Unless you're trying to compete, then yes, the dosage must go up and up, basically as much as you can afford, and still stay awake. The cost is what sucks. Humatrope and Genotropin are 2 of the most expensive. Serostim can be bought for much cheaper, and is excellent as well. All that said, everyone is different, and some need more or less to get results, but in general, assuming you have a legit product, you will see great results from 2iu of Huma or Geno. $400 for 36 iu is tad high. $600 for a 72 iu pen is about the going rate for Humatrope, Geno just a bit more, but not significantly. If the product came from a USA pharmacy there will be a script on the box, always. Obviously the name will be ripped off or blacked out, but there will be a script on the box. If not, I would not buy the product. The grey tops that are out are actually a very good generic, better than the old Thanktropins, I know many guys using them that don't use pharm grade GH and getting great results with them.