Daidzein and other isoflavone compounds, such as genistein, are present in a number of plants and herbs like the Thai Kwao Krua or Pueraria mirifica, Kudzu or Pueraria lobata. It can also be found in Maackia amurensis cell cultures.
aidzein can be found in food such as soybeans and soy products like tofu and textured vegetable protein. Soy isoflavones are a group of compounds found in and isolated from the soybean. Of note, total isoflavones in soy beans are—in general—37 percent daidzein, 57 percent genistein and 6 percent glycitein, according to USDA data.[2] Soy germ contains 41.7 percent daidzein
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