Of course most is speculation, but this is fun. I would have to give a few I think:
1. Bridgette Nielson (test, tren, deca, dbol) lol. looks like it anyways.
2. Tom Hardy
3. Dane Cook (not speculation. I know for a fact he runs tren only cycles)
4. Optimus Prime
5. Zac Effron
6. Zyzz
7. Tyler Perry (rumored)
8. 50 cent
9. Nelly
10. Chris Evans
More to come........