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特許 権利維持 Equol (4',7-isoflavandiol) is an isoflavandiol[1] metabolized from daidzein, a type of isoflavone, by bacterial flora in the intestines.[2] While endogenous estrogenic hormones such as estradiol are steroids, equol is a nonsteroidal estrogen. However, only about 30-50% of people have intestinal bacteria that make equol.