is IGF-1 responsible for the growth effects of GH?
maybe. but it woudlnt be normal igf-1, it would be liver igf-1. (for more on this id suggest doing some research.. MD had a good article on it a while back, might try diggint that up)
GH is related to over 400 different growth mechanisms/messengers/pathways in the body. only one of them is igf-1.
another one hypothesized to be of great importance if MGF (mechano growth factor)
for now, AAS is the only staple. GH and t3 are both worthy drugs as well. AAS for size. GH for lean gains, overall thickness/roundness, and skin beauty. t3 for fat loss.