Probably not. Proscar( finasteride) only PREVENTS test from aromatizing into DHT. Winny is a DHT derivative already, if it affects the prostate Proscar will not help that. Dbol is a test derivative, but it aromatizes mainly to estrogen I believe, very little goes back to test, then to DHT, so it won't help much there. And your natural test levels will be very suppressed, so you won't have much natural test to prevent from aromatizing into DHT. All that aside, I would still run it, as there will be SOME DHT in your system still and it probably can't hurt to keep the levels low for prostate and hair safety.