Quercetin is one of the flavonoids groups. It is in fact a flavonol. It is found in apples, onions, tea, red grapes, leafy green vegetables, citrus fruits, broccoli, cherries, raspberries, prickly pear cactus, and some varieties of honey. Especially, those made from the Eucalyptus flower. Quercetin is a very active form of flavonoid. It is present in many medicine plants…