I think it has a role if you're on GH at least. Then add other crap like IGF-1 and T3.
Insulin w/o GH will make you fat. And be careful. It's not just that it's deadly, it can promote insulin resistance, so you might wanna run some serious R-ALA plus use other stuff to increase insulin sensitivity (like glucagon) after your slin run.
Complicated stacking required, and I'm not one to advise, but after research and experimentation (yeh, i tried it and in made me fat), I know it's not for me.