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- Flavonoids as a broad class are plant-derived polyphenols

- Isoflavonoids are a subgroup of flavonoids which have the second phenol ring in the C3 position

- Examples of isoflavonoids include genistein, which has been widely studied, and daidzein. Equol is another isoflavonoid which is created by intestinal bacteria from genistein and daidzein in about 30% of people