Aromatase Inhibitors

Aromatase inhibitors (AI’s) work by withholding the production of estrogen in postmenopausal women. They block the enzyme aromatase, which turns the hormone androgen into small amounts of estrogen in the body. This means that less estrogen is available to stimulate the growth of hormone-receptor-positive breast cancer cells. In bodybuilding and sports, they are used to avoid the harsh implication of Gyno.