Warning to the easy talk of using steroids. Back in the day I competed in powferlifting when the drug free/natural organizations started up. A lot of the guys took steroids just to stay competitive, even though they knew it was harmful. When the opportunity came to compete without them, many migrated over.
So what happened? Ironically some of them died. I know a few guys who did around 45-55 that shouldn't have.
When you inject the unnatural version of body functions, the body figures it can shut down its own natural function.
I've heard its actually healthier to just stay on them to some degree (with the aid of professional) because if you quit, your body will become dysfunctional trying to re-create its own system after years of slumber.