Active Ingredient: Tamoxifen Citrate

Generic Names: Nolvadex, Zymoplex, Cytotam

Tamoxifen is the most well known and widely used Anti Estrogen. Tamoxifen works by binding to the estrogen receptors in the body, preventing estrogen from binding to these sites. Hence, why Tamoxifen is referred to also as an "estrogen blocker" or by it's more medical term: SERM (Selective Estrogen Receptor Modulator).

In women Tamoxifen is used as a breast cancer medication, blocking estrogen is vital to stop cancer spread. In men Tamoxifen is used to mainly prevent gynecomastia (formation of female like breast tissue in men).

Tamoxifen is also used to promote the secretion of LH (Luteinizing hormone). LH is a very important hormone for both women and men. In females, LH stimulates the saturation and release of ova (eggs) as known as ovulation. In men, LH is responsible for the production of testosterone (the male hormone) by the Leydig cells of the testes in males. Athletes and bodybuilders who use anabolic steroids and other performance enhancing drugs, frequently use Tamoxifen in order to block estrogen that result as a side effect from using drugs.

Since Tamoxifen also acts as LH stimulator, much like clomid does. It encourages natural testosterone production in men. Many men prefer Tamoxifen over Clomid for that purpose, in fear that Clomid causes many side effects while Tamoxifen doesn't. This is not quite documented in medical literature, since most trials used Tamoxifen for treating breast cancer in women rather than encouraging LH and testosterone production in men.