Most pro bb'ers combine hGh and insulin because GH injections can cause insulin resistance. And insulin is a very anabolic hormone. Its not as dangerous as everyone here is making it out to be. As long as you eat 10g of carbs per iu of insulin injected you will likely be fine. But most people who fuck up with it can't read a syringe and inject way to much insulin. 10iu of insulin isn't going to kill anyone. The worst that will happen is that if you don't eat after injecting it you will become hypoglycemic which means your blood sugar is less than 60ng/mL and you will feel very hungry. If you eat simple sugars you will be fine. But if you're really asking this question I would imagine you're not ready for insulin and probably never will be. My advice is to stay away from exogenous insulin.

Insulin is a peptide hormone your body produces to allow your cells to use sugar from food you eat. Do not mess with insulin injections unless you are a diabetic. I have done it before and I went almost immediately into hypoglycemia and almost passed out. I will never mess with injectable insulin again. I highly recommend that you don't fuck with injectable insulin. As people have said here, it will kill you and kill you fast and its not a pleasant feeling. Imagine being the most hungry you've ever been than multiply it by 100.

Insulin is prescribed to diabetics and HGH is prescribed to adults with HGH deficiency due to rare pituitary tumors or their treatment
Muscle wasting disease associated with HIV/AIDS and in children it's prescribed for growth related problems associated with health issues.