Daidzein

Daidzein is an isoflavone (a type of flavonoid) found in several plants including kudzu and soybeans. It often appears along with genistein.

Kudzu root was found to contain 12.6 mg/100 g dry weight of genistein and 184 mg/100 g dry weight of daidzein.[1]

Soybeans were fount to contain 26.8-102.5 mg/100 g dry weight genistein and 10.5-85.0 mg/100 g dry weight of daidzein.[1]

Bibliography
1. Phytoestrogens and Health
G. Sarwar Gilani, John J.B. Anderson; The American Oil Chemists Society, 2002; ISBN 1893997324, 9781893997325
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