Daidzein structurally belongs to the group of isoflavones. It and other isoflavone compounds, such as genistein, are present in a number of plants and herbs like Kwao Krua (Pueraria mirifica) and Kudzu (Pueraria lobata). It can also be found in Maackia amurensis cell cultures. Daidzein can be found in food such as soybeans and soy products like tofu and textured vegetable protein. It has both estrogenic and anti-estrogenic effects.