Clomiphene Citrate blocks estrogen receptors at the cellular level and doesn’t suppress body’s own estrogen production. 

Clomiphene citrate is a potent antiestrogen drug similar to Tamoxifen (tamoxifen citrate). The medicine was first used in female patients in the 1970s to treat infertility. This antiestrogen is used by athletes during anabolic-androgenic steroid cycles to reduce undesirable adverse reactions induced by the conversion of testosterone to estrogen (a female sex hormone) and to increase the development of natural testosterone during post-cycle therapy.