Nolvadex, or Tamoxifen, is a selective estrogen receptor modulator (SERM) that is commonly used in bodybuilding and post-cycle therapy (PCT) to manage estrogen levels. It works by binding to estrogen receptors in certain tissues, blocking estrogen’s effects, and preventing side effects like gynecomastia, water retention, and fat gain during anabolic steroid cycles. Nolvadex is also used in hormone replacement therapy (HRT) and breast cancer treatment. It is ideal for athletes and bodybuilders seeking to control estrogenic side effects while maintaining optimal testosterone levels during or after steroid use.