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Quercetin 98% is best known for its anti-inflammatory and antioxidant properties. It is often found in herbal and nutritional formulas used to treat allergies and inflammation. It is one of the common flavonoids in human diet. The intake of quercetin is negatively correlated with the incidence of some chronic diseases such as coronary heart disease and tumor. A large number of experimental research results at home and abroad show that in addition to the significant antioxidant effect of quercetin in vitro, it also has the effects of inhibiting tumor cell growth, reducing inflammation, inhibiting vascular proliferation, regulating immune function, and anti-aging.