“Anadrol of itself should not cause gyno. It is possible that it could however, compromise liver clearance of estrogen, allowing more in the system. This is more likely if high doses of testosterone are also used which do increase estrogen. Arimidex can reduce estrogen no matter what is happening though, so if gyno presents itself, Arimidex should be considered.
Anadrol does not increase progesterone either, by the way.”