Quercetin is one of the most widely distributed natural flavonoid compounds in nature, existing abundantly in various fruits, vegetables, grains, and some traditional Chinese medicinal materials.
Quercetin, a polyhydroxy flavonoid compound extracted from rutin, possesses a wide range of biological activities and extensive pharmacological effects.
With the development and utilization of traditional Chinese medicine, quercetin and its derivatives have been discovered in various Chinese medicinal materials and foods.