Some people pay A LOT of money to have high igf-1 levels.
The only problems I can see with igf-1 (and gh) is Unlike testosterone, igf1 and gh are not selective to the tissues they grow. This in shot means if you have a small cancer or tumor, I could get a whole lot bigger.
When I had my cancer, I had to avoid anything that increased my igf-1 levels - milk is quite effective at this.
Noobs and Fadi will know a bucket load more than I, Im sure they will chirp in soon.