Insulin is super easy to obtain, and dangerous as well of course. I used to get it at the pharmacy, just said it was for my diabetic grandfather. I make sure to research everything before I use it, so I used insulin safely for a while back in the day....not so sure it was that great though? and I'd eat like a horse too....makes you hungry as fuq....I wasn't that impressed with it. I do feel the GDA's really help with nutrient partitioning though, allow you to cheat with your diet and things like that....like whacked said, you can never compare natural stuff to the real deal....well every once in a while a natty supp comes along that *****s the real thing....but not very often....