On the non-testosterone side of hormones Insulin, HGH, and T3/4 are pretty darn big deals.
Where does IGF fall into all of this? Some say it depends on if you are interested in site growth or fat loss but is it "really needed"?
Testosterone = Have to have
HGH = If you got the cash it is definitely worth it
Insulin = If you are responsible then it is definitely worth it
IGF = ?
Replies are appreciated