I think it was Jonah Keri who pointed out (via Twitter, Reader/Buzz, or his blog -- I'm not sure which) Tim Marchman's blog, about which I had not previously known. (Marchman is a former baseball columnist for the New York Sun.) The following quote (link) illustrates why I'm incredibly grateful to Jonah for doing so:

Formestane is an aromatase inhibitor; it's not magical dope in its own right, but is taken with other drugs to, among other things, prevent the growth of breasts. Drug testing skeptics can note that the three players who tested positive for bitch tit avoidance didn't test positive for drugs that would cause bitch tits.