i will agree with the mechanic on GH, however, as far as roids.....you can gain some mass but only a good diet and good training and dedication cause larger muscles, leaner composition and vascularity. is hard to stay vascular when you have alot of fat and/or water.
i like test for overall siz and strength. if you watch what you eat and use anti-e the gains come without too much water. i like proviron to help keep the water off.
no matter what, you have to eat right and train right for optimum results. even roids are not miracle drugs, if they were everyone would look like ronnie coleman.