From the Manufacturer:
In traditional Chinese medicine, Kudzu Root is used in prescriptions for the treatment of "wei," or "superficial" syndrome (a disease that manifests just under the surface - mild, but with fever), thirst, headache, and stiff neck with pain due to high blood pressure. It was also recommended for allergies, migraine headaches, measles eruptions in children, and diarrhea. It was also used as a treatment for angina pectoris. The roots provide a fiber for the textile industry. The process for extracting the starch from the roots is tedious and can take up to 120 days, during which it is chopped, washed, pounded into a mass, and filtered up to 50 times.
The primary chemical constituents of Kudzu include starch, isoflavonoids, puerarin, daidzein, and phytoestrogens. Kudzu Root is high in isoflavones, such as daidzein, as well as isoflavone glycosides, such as daidzin and puerarin. Depending on its growing conditions, the total isoflavone content varies from 2-12%, with puerarin in the highest concentration, followed by daidzin and daidzein. It has some demulcent properties, making it useful for thirst and dryness. Also, the flowers have been shown to be effective in lessening the desire for alcohol, and thus are used in the treatment of alcoholism. This herb also helps counteract poisons.