Potent Estrogen Inhibitor
6-oxo contains a naturally occurring aromatese inhibitor that is devoid of any direct hormonal or prohormonal activity (androgenic or estrogenic). It is what science refers to as a "suicidal inhibitor" of aromatese.
Specifically this means that it will irreversibly bind to the aromatese enzyme and permanently deactivate it.
With prolonged use of 6-OXO the result will be a very substantial reduction in the production of estrogen in the body, along with a coinciding up-regulation of natural (testicular) testosterone production.