It's a possibility. He definitely looks beyond human. Then again, he has also been training with an insane level of dedication since he was 0 and was raised from birth to be a fighting machine.
But I think there's probably little-to-no doubt that he's not going out and getting the stuff himself, so it comes down to whether or not you think his dad would actually feed his teenage son steroids. I find it a bit far fetched, especially considering all the church-going Jesus stuff we get out of Sage, but fuck who knows.
Your thoughts?