This is the first available supplement that includes butein chalcones. These substances, according to the latest research by Y. Wang (Department of Biochemistry, Chinese University of Hong Kong, Rm. 507C MMW Bldg., Shatin, NT, Hongkong) can reduce aromatase by 90%, therefore much more than synthetic inhibitors (Arimidex, mesterolone). Research is currently being conducted on the use of butein in the treatment of estrogen-related neoplasm, but the substance is not yet available for athletes participating in competitive sports. Henryk Różański, MD., has conducted studies on pharmaceutical products of this type and has developed a product that can be used as a supplement by athletes.