Hops are the female flowers of the hop plant and have high levels of phytoestrogen, or estrogen for plants. Hops were historically used in herbal medicine pre-1500s to treat insomnia and as a source of phytoestrogen to help with menopause and endometriosis among women.
However, a recurring suggestion has been that hops have a powerful estrogenic activity and that beer may also be estrogenic. We have identified a potent phytoestrogen in hops, 8-prenylnaringenin, which has an activity greater than other established plant estrogens.