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]

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