===================== CLICK HERE TO SHOP ONLINE: https://t.co/VBWHH4dD05 ===================== Masteron vs. Primobolan. Similarities: Both are DHT steroids. Masteron was originally used medically for breast cancer, while primobolan was originally used as a pure bodybuilding steroid. Masteron vs. Primobolan. Please share your experience if you've used both steroids. Masteron won't yield nearly the same amounts of lean tissue or fullness (zero fullness on mast actually).