cwilhelmi, actually, it appears that steroids may not be as widely abused as once thought.
Instead, it seems to be more likely that the "drugs of choice" for most is several things, first, they seem to like using "Human growth hormone"; a mixture of chemicals that allow rabid growth of muscle mass, Erythropoietin; which allows for faster production of red blood cells, helping the creation of muscle mass, and mainly, the use of cartilage pills; both shark and cow cartilage are the most popular, the both increase the creation of muscle mass quickly.
While most of these drugs are banned in most sports, it seems none of them are banned by the MLB.
These drugs lead to serious problems with "gigantism" and back and joint problems.
This would explain why McGuire ended up with STRETCH marks on his neck from "swelling" along with very serious back and joint problems.
I would bet that Bonds, Sosa, McGuire... along with most of todays power hitters have passed up steroids for the most part and have gone directly to this 'cocktail' instead. It has fewer direct side-effects and will provide almost the same results.