Zearalenone, a mycotoxin from Fusarium mold, is a potent estrogenic compound used to fatten cattle by affecting their estrogen levels.

“People freak out about soy. You want to talk about something crazy estrogenic? Zearalenone, they'll put it in the ears of cows. I know Dave Asprey talked about that years ago when he he promoting his moldy documentary. and they'll use it to fatten up cows by affecting their estrogen.”