abso-freaking-lutely. just look at him. he was a juicer and there is no doubt about it.
It's very possible to build yourself up like that using legitimate methods, I'm not saying that's how he got that way, but concluding someone 'juiced' simply because they bulked way up while they were in their 20's would be a mistake. Because of the culture of juicing in baseball, I would say there's a good chance he was involved in it, but I'm not foolish enough to say he juiced simply because he's bulked-up and ripped.