Are you talking about gyno from the test or deca...that's the only problem with the "perfect" newbie stack..you got to deal with estrogen from two different sources. Staying at 500 sust and 300-400 deca should keep you safe, but get some nolva and you should be fine no matter what happens. And if you really want protection, get yourself a vial of liquidex 1mg/ml or 4mg/ml -- both of em work good.