Now this is one of my personal favourites and I often use it in conjunction with Nolvadex as I find the two do work better together in my opinion and experience. It is in fact an oral androgenic steroid which is commonly used as an estrogen antagonist (A chemical substance that interferes with the physiological action of another, especially by combining with and blocking its nerve receptor). Once in the blood stream it actually takes on the estrogen at the receptor sites and can greatly (I some cases) reduce the aromatizing effect (water retention) of other steroids. It can dramatically increase the hardness of the physique in the right conditions.
It is best used at around 2-4 tablets a day @ 25mg per tablet. I prefer the dosage of 20mg of Nolvadex and 50mg of Proviron for a basic intake. But there is another side to that of Proviron and it ties in with the next anti-estrogen blocker Arimidex.