I dont know much about HGH, but for the accusations of using steroids, I dont see it.
Basketball is one sport where I dont think any extended use of steroids would be beneficial. Obviously Lebron could have used steroids to get as big as he is, but to play a sport like basketball I would think it would make him highly injury prone. It's easy in baseball when all you have to do is stand and swing and run side to side to field balls, but basketball the constant back and forth, sprinting, changing direction, and collision, I just cant see a player being able to stay healthy. Not to mention the abuse Lebron takes constantly driving to the basket and getting fouled.
Sorry, I just dont see it. However to answer the OPs original comment, No I would not be suprised if I found out Lebron was on roids or HGH, and it has nothing to do with Lebron, its just the fact that there isnt one player out there now that would suprise me if caught.