Soy isoflavones Isoflavones are one of the flavonoids, mainly exists in leguminous plants, soybean isoflavones in soybean growth is forming a kind of secondary metabolites. Because is extracted from plants, has similar structure with estrogen, so also called phytoestrogens, soybean isoflavones could make up for a lack of women after the age of 30 female hormone secretion defects, improve skin moisture and elasticity, relieve menopausal syndrome and to improve osteoporosis, making women reproduce youthful charm. Soybean isoflavones estrogen effect affect hormone secretion and metabolism of biological activity, protein synthesis and growth factor activity, is a natural cancer chemoprevention agent.