Mass FX MS contains potent ingredients such as the forementioned divanil as well as 25r-diol and other that synergistically boost free test as well as total test. It also has a very mild anti-estrogen in it... If you are looking for a stronger test boosting AND anti-estrogen stack, mass fx stacked with our 6-bromo (anti-estrogen) product, hyperdrol x2 , would be a perfect choice for you