Anti-estrogens are drugs that are actively used in strength sports and bodybuilding. The use of anti-estrogens on a steroid course is due to the need to prevent or reduce the side effects of anabolics associated with the formation of estradiol from testosterone and its derivatives. On SCT, anti-estrogens contribute to the restoration of endogenous testosterone synthesis by increasing the production of luteinizing hormone of the pituitary gland and normalizing the work of the entire sexual arc (hypothalamus-pituitary-testicles);