I wanted to see if there was really a diff between humatrope and serostim. I ran 3'iu's humatrope a while back for 3weeks then did the standard 10iu 3hrs pre labs for GH serum. As you can see my GH serum was 28.7 and IGF was 293. So then I switched to serostim and ran 3iu's for 3weeks and did the standard 10iu 3hrs pre labs for GH serum. As you can see GH serum is 22.9 and IGF was 327. I havent noticed any changes in how I look or feel on sero's v.s. humatrope so for now on I will use serostim. I pay $12 per iu for humatrope and $6 per iu for serostim so its a no brainer for now on. From all the tests ive seen I dont think GH serum is nearly as important as IGF.