Of course, estrogen has many effects throughout the body. It is dangerous to block its action indiscriminately. For instance, estrogen is also important in bone. Star therapies of the breast oncology world -- like tamoxifen (Nolvadex) "All they do is block estrogen," Fred Rowlett, president of the North. Tamoxifen acts as a selective estrogen receptor Tamoxifen needs to block growth factor proteins.
Is nolvadex an estrogen blocker? - everything