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A yellow flavonol, C15H10O7, found in glycoside form in tea and in many vegetables and fruits. It is an antioxidant and is used as a dietary supplement for its supposed antihistaminic, anti-inflammatory, and antitumor properties.

[Latin quercētum, oak forest (from quercus, oak; see perkwu- in Indo-European roots) + -in.]


(ˈkwɜːsɪtɪn) or


(Elements & Compounds) a yellow crystalline pigment found naturally in the rind and bark of many plants. It is used in medicine to treat fragile capillaries. Formula: C15H10O7; melting pt: 316–7°C. Also called: flavin
[C19: from Latin quercētum an oak forest (from quercus an oak) + -in]
quercetic adj
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References in periodicals archive ?
A research team focused on one of the compounds, quercetin, which is found in tea, onions and apples, BBC health reported on Friday.
Previous research had shown quercetin is metabolized very quickly by the intestine and liver and is not actually found in human blood.
Findings described in the Journal of Controlled Release suggest that the polyphenols resveratrol and quercetin could help improve the safety of Adriamycin (doxorubicin), an effective but potentially cardiotoxic chemotherapy.
Background: We previously demonstrated that the bioactivity of quercetin could be improved through conjugation with a hydrolysable pivaloxymethyl (POM) group.
The high consumption of processed tomato products in the Western diet has made them a significant source of vitamin C, beta-carotene, lycopene and the flavonoid quercetin.
While there are drugs and medicines to control and correct asthma in overweight people, it has also been found that a strict and well-balanced diet, rich in Vitamin C, E, B6, Quercetin, Rosmarinic Acid, Omega- 3 fats, carotenoids, magnesium and potassium goes a long way in reducing weight and controlling asthma.
Patient One GastroOne is a Strawberry flavored supplement designed to support gastrointestinal (GI) health and function, combining L-Glutarnine, N-Acetyl-D-Glucosamine (NAG), De-glycyrrhizinated licorice extract (DGL), aloe vera, slippery elm, marshmallow root, fenugreek, mucin, Methylsulfonylrneth--ane (MSM), chamomile, ginger, quercetin, FiberAid and Zinc L-Carnosine.
Quercetin, an antioxidant that is found mainly in the skin, has proven more effective than vitamin C at protecting brain cells from oxidative damage.
Since it's fairly widespread in the diet (at least for those folks who eat their veggies and the peels of the apples), you're likely to have at least some quercetin in your diet.
Quercetin (Que; 3,3',4',5,7-pentahydroxyflavone) is an important member of the flavonoid family that is present in plants and red wine (7).
Apples are a good source of an antioxidant called quercetin.
com)-- Doctor's Best has introduced Quercetin Bromelain into its dietary supplement line.