We often hear bodybuilder talk about Tamoxifen, and for those who don’t know PCT, it’s a bit confusing: Does the breast cancer drug Tamoxifen build muscle, and why does bodybuilder use it? What is Tamoxifen? Tamoxifen, sold under the brand name Nolvadex, is FDA-approved to treat and prevent breast cancer in men and women, and it is one of the …