Interleukin

[Weam]

I know that it's a very massive drug in genetic engeenering which treat cancer & varioud kinds of genetic diseases including diabetes, osteoporosis etc.
but the point is why Bodybuilders use it, it isn't just a rumor but I have a friend who're competing on Mr. World competitions and he's using it & telling me many guys (but not too much) uses it

any comments!