Here's a link:
http://www.steroid.com/IGF.php
It says:
"So how can we use this stuff? Well first let´s talk about creating an ideal environment for IGF1 to function. See, as you´ve already read, there is a very great interdependence and synergy between IGF, Insulin, and GH.
It has been clearly observed in studies that when GH and IGF1 are used together, you´ll get greater results in the accumulation of Lean Body Mass than you would by using either of them alone (10).In addition, there is a very strong probability that testosterone would be synergistic to GH (4), and would also increase IGF levels in muscle (11). "
It also says:
"
you will lose more fat and gain more muscle when you combine GH and IGF-1 than you would using either alone. The subjects in this study, over 12 weeks gained around 3kgs of lean mass, and lost around 2kgs of fat. Clearly, when we use IGF, we are going to want to use it with GH. And we know that GH functions best when used in conjunction with testosterone. And since we know that GH increases insulin sensitivity, we can throw in some insulin with that GH, and if we are using insulin and don´t want to get fat; I´d be most comfortable if I could add in a fat burner like T3 with it.
So there we have a laundry list of items essential to get the most out of our IGF use but lets be honest, if you have the money to use IGF (and IGF is expensive stuff), then you should really be including these other items to maximize it´s effects."