Isoxanthohumol is a prenylflavonoid, and it is a phytoestrogen.

8-Prenylnaringenin can be produced from isoxanthohumol by flora in the human intestine,[1] and by fungi in cell cultures.

[2] This prenylflavonoid is found in hops and beer.

At the concentration found in beer, it is unlikely to have an estrogenic effect in breast tissue.

[4] This article about an aromatic compound is a stub.