I just got some Mast E myself and from all I've researched, it WILL cause BPH and hair-loss, especially if genetically prone. It is already a DHT derivative, so finasteride will not counter as the only thing finasteride does is block the conversion TO DHT. I now think maybe I should've gone with Primobolan to stack with test instead of the Mast. I was not super fond of my near bald head in boot camp, and I wouldn't be fond of it now.