Here's an old post of mine from another thread that will break it down for you in easy to understand language.
So per the NSAC, Jones tested positive for Hydroxy-clomiphene, "an anti-estrogenic agent" & "Letrozole metabolite, an "aromatase inhibitor"
What does this mean? Why was he taking estrogen blockers?
Because he was on the gas lol. Anti aromatase agent will prevent your body from compensating for the extra test you're injecting. Prevents bitch tits etc.
He's been on for awhile. Anyone that's taking decent amounts of juice needs anti aromatase inhibitors.
Or it converts.
Aka titties.