Ah, OK, thank you for clarifying. My actual protocol for LR3 use considers training status (how advanced the bodybuilder is; and only applies it in very advanced cases) foremost. Without just giving to what is rather proprietary information, I can say that its use would be site-specific & administered post- training.
The reason that we don't combine insulin & IGF-I analogues (either as rhIGF-I or LR3 IGF-I) is simply because the former overpowers the latter, but also does a plethora of other things, some of which we may not want. The latter (IGF-I & its analogues) serve primarily to stimulate muscle cell proliferation & differentiation (mitogenic & myogenic effects), and it does this fairly narrowly (but with hypoglycemic effects as well). With insulin, well, there's a good article on all that does (quite a lot; including activities we may very well not want) with respect to hypertrophy here:
Insulin's effects and mechanisms in promoting skeletal muscle hypertrophy - MESO-Rx