I have an old bottle of superdrol hanging around.
Don't really know on that, sure some other guys on here do know though if it'll shut you down hard. If it's exogenous test it'll shut you down, maybe a few big doses.
I got bored a while back and used an Ironmaglabs product, something that was supposed to be really potent from reviews, I took it in pretty large amounts and stopped cold turkey and didn't feel any difference.