If you are using tren, then you do not need to use an estrogen blocker/antagonist. Estrogen will not form in your body from tren. What you need to worry about is the release of an abundance or prolactin. Prolactin can also cause gyno, just like estrogen, but even the largest amount of Nolvadex on the face of the earth will not prevent the release of prolactin. Instead of Nolvadex, get some cabergoline, or bromocriptine. This is what you need to incorporate in your PCT. Nolvadex is worthless to you now.... Arnold Jr, you should know this.... hcg would help as well.