basically the same thing. mastabol is dht based, it is like an injectable proviron in many ways. does not aromatize. you can use it as an antiestrogen, as it binds to aromatase, letting other steroids do their thing. (this is what most people use proviron for). you will want to have your bf% low to realize the benefits of masteron bro, then you can get that "ripped" look. masteron is a great complement to deca and eq, giving you good muscle growth with fairly no water retention. proviron/winny/primo all made me break out though(acne)and i fear masteron would too since it is DHT derived gear and has a great affinity for the sebacious glands (and the hairline if you are sensitive or prone to MPB) hope this helps bro. by the way i got most of this info from a2004