Scientific Names: 3′,4′,5,7-Tetrahydroxy-3-(α-L-rhamnopyranosyloxy)flavone, 2-(3,4-Dihydroxyphenyl)-5,7-dihydroxy-3-{[(2S,3R,4R,5R,6S)-3,4,5-trihydroxy-6-methyloxan-2-yl]oxy}-4H-1-benzopyran-4-one
Quercetin, a polyphenol belonging to the flavonoid category within the flavonol subclass, is widely distributed in fruits, vegetables, leaves, seeds, and grains. Common foods like capers, red onions, and kale contain appreciable amounts of this compound, known for its bitter flavor. Quercetin serves as a key ingredient in dietary supplements, beverages, and various foods. With an average daily consumption ranging from 25 to 50 milligrams, it stands as one of the most abundant dietary flavonoids.