Soy Isoflavones are produced via a branch of the general phenylpropanoid pathway that produces flavonoid compounds in higher plants. Soybeans are the most common source of isoflavones in human food; the major isoflavones in soybean are genistein and daidzein. The phenylpropanoid pathway begins from the amino acid phenylalanine, and an intermediate of the pathway, naringenin, is sequentially converted into the isoflavone genistein by two legume-specific enzymes, isoflavone synthase, and a dehydratase.
Similarly, another intermediate naringenin chalcone is converted to the isoflavone daidzein by sequential action of three legume-specific enzymes: chalcone reductase, type II chalcone isomerase, and isoflavone synthase. Plants use isoflavones and their derivatives as phytoalexin compounds to ward off disease-causing pathogenic fungi and other microbes.
In addition, soybean uses isoflavones to stimulate soil-microbe rhizobium to form nitrogen-fixing root nodules.

Function:
1.Prevent Cancer and Anti-cancer
Soy Isoflavone can cure and restrain some cancers concerning hormone, such as prostate cancer, galactophore cancer etc..
2.Low Cholesterin Thickness in Human Body, Prevent and Cure Cardiovascular Illness
Soy Isoflavone can prolong the anti-oxygenation time of low density albumen, its anti-oxygenation effect is the same with Vitamin E.
3.Cure Woman Menopause Syndrome
Soy Isoflavone is used in replacing therapeutics after menopause, and has no side effect.
4.Prevent and Cure Osteoporosis
Soy Isoflavone has some equal effects with estrogen, can prevent osteoporosis caused by estrogen bone absorption sthenic.