Quercetin:3,3',4',5,7-Pentahydroxyflavone dihydrate:Introduction and Its Benefit Applications.

Natural sources:Quercetin.

Quercetin:3,3',4',5,7-Pentahydroxyflavone dihydrate CAS:6151-25-3 EINECS ELINCS No.:204-187-1 Chem IUPAC Name:2-(3,4-dihydroxyphenyl)-3,5,7-trihydroxychromen-4-one bioflavonoid anti-tumour photo picture image Quercetin is found in many common foods including apple, tea, onion, nuts, berries, cauliflower and cabbage. Foods rich in quercetin include apples, black and green tea, onions (higher concentrations of quercetin occur in the outermost rings), raspberries, red wine, red grapes, citrus fruits, broccoli and other leafy green vegetables, and cherries. A study by the University of Queensland, Australia, has also indicated the presence of quercetin in varieties of honey, including honey derived from eucalyptus and tea tree flowers.

Quercetin is widely distributed in the plant kingdom and is the most abundant of the flavonoid molecules. It is found in many often-consumed foods, including apple, onion, tea, berries, and brassica vegetables, as well as many seeds, nuts, flowers, barks, and leaves. It is also found in medicinal botanicals, including Ginkgo biloba, Hypericum perforatum (St. John's Wort), Sambucus canadensis (Elder), and many others. It is often a major component of the medicinal activity of the plant, and has been shown in experimental studies to have numerous effects on the body.It occurs very predominantly in red onions and broccoli. However if you think you should immediately take it off your menu because of its mutagenicity, persons with diets high in onions and garlic, which at dry weight have qercetin levels of 3% to 4%, have a 20-fold lower cancer risk than persons who don't eat these vegetables.