For genistein,there are two sources-natural one and synthetic one.
And the natural genistein is extracted from the fruit of Sophora japonica L..
Which source do you need?

Genistein can combine with estrogen receptor and have weak estrogen effect. So it is also called phytoestrogen. It is antagonistic to estrogen. It has the protective effect for hormone related diseases. It can improve and prevent climacteric syndrome and osteoporosis. It can serve as food supplement to be widely used in various healthy food for the middle-aged and old people. 

Genistein binds to and inhibits protein-tyrosine kinase, thereby disrupting signal transduction and inducing cell differentiation. This agent also inhibits topoisomerase-II, leading to DNA fragmentation and apoptosis, and induces G2/M cell cycle arrest.

Genistein exhibits antioxidant, antiangiogenic, and immunosuppressive activities.

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