I asked my doctor about taking insulin for bodybuilding. He said no only for the reason of going into hypo and dying. He didn't mention it shutting down pancreatic function. I have taken insulin, i saw good gains, especially with strength when i used creatine. If you do it right, and you are a very careful person, insulin can be managed. But if you are clumbsy, forgetfull, or dumb, insulin can have deadly consequences.