This product is the dried rhizome of the Polypodiaceae plant Drynaria Fortunei. Its main active ingredient is naringin. Naringin is a dihydroflavonoid. Because there is no conjugation between ring A and ring B, there is a strong uv absorption peak at 282nm, which makes naringin show a variety of biological activities and pharmacological effects. It not only has anti-inflammatory, antiviral, anticancer, anti-mutation, anti-allergy, anti-ulcer, analgesic effects, but also can lower blood pressure, cholesterol, reduce the formation of thrombosis. What's more, it improves local microcirculation and nutrition supply, can be used in the production and prevention of cardiovascular and cerebrovascular diseases.