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“ Quercetin , a natural dietary constituent, is a potent inhibitor of estrone sulfatase in vitro, and thus has the potential to express antiestrogenic activity in vivo.”
The Journal of Steroid Biochemistry and Molecular Biology • 1997 | View Paper
“Similarly, several flavonoids (naringenin, hesperetin, kaempferol, quercetin , rutin, flavone, alpha-naphthoflavone and beta-naphthoflavone) also inhibited rat liver microsomal glucuronidation of estrone and estradiol to varying degrees.”