I use hgh for both muscle gains and leaning out. 4 iu's delivers a little bit of both (again: my stuff is pharm grade and i don't think generics is as effective per iu) I do use it with test however so some of the muscle gain comes from the test i guess.
The combo is ok. I've used it several times. I do it like this: 2iu's hgh twice ed and 40 mcg igf pwo eod.
I got better results with a combo of hgh an MGF tho. I think the reason is that any muscle growth from hgh is due to raised levels of igf anyways. That means that the mechanism is hyperplasia which means the generation of new cells in the tissue. Adding igf to hgh then is just boosting the hyperplasia instead of adding something else. MGF on the other hand causes the cells to grow larger just like aas. Then u have both more and larger cells. That is true synergy right there.
Hope this answers ur questions.