You didn't mention the dose you plan on taking. 4 months should show some results, but as someone said, it may be limited to fat loss at that point.
I've been on for 4 months @ 4iu 5 on 2 off, and at this point I've noticed a great deal of fat loss in my midsection (this month particularly) with no drop in calories or change in food for the most part. I've also gained a couple of lbs; but that could be the delayed effects of 2 months of IGF use - I'm not ready to give the HGH credit for that. I plan on staying on it at that dose for a long time. I've also added pegMGF (50 mcg/day) and I'll be adding hMGF (200 mcg/day locally split into 2 doses) and more IGF (50 mcg/day) and Test E