AI -Aromatase inhibitors things like Arimidex & letrozole basically they block the production of estrogen or block the action of estrogen on receptors

SERM-selective estrogen receptor modulators things like tamoxifen(Nolvadex) & clomid these only block the action of eastrogen on receptors

HCG-human chorionic gonadotropin is basically madre from pregnant womans hormones witch helps with producing natural test this does convert to eastrogen quickly so use with anti E

know your PCT will help with recovery and keeping them gains you get from cycle