25mg/ED and through PCT.
However, I found Proviron to be very weak at combating estrogenic sides, so weak at 50-75mg/ED I still got puffy nips.
There is also no clinical evidence to suggest Proviron lowers estrogen, other than it being a DHT, which is why it has this soposed use as an AI. It works the same way Winstrol and Masteron combat estrogenic sides.
But its often not enough. Run some Arimidex at 0.5mg/EOD IMO.