What is the difference in novedex xt and nolvadex (tamoxifen)?

Novedex vs Nolvadex (tamoxifen) Novedex xt is a product used to increase testosterone & muscle mass; it blocks the conversion of testosterone to estrogen, but apparently does not increase muscle mass.Nolvadex (tamoxifen) is used to treat breast cancer, but it reportedly is used by bodybuilders who use Anabolic steroids to prevent gynecomastia (enlarged breasts due to breast tissue rather than muscle. See following comment.