Quercetin is a flavonol (flavonoid), and in the aglycone form of other flavonoid glycosides (rutin and quercitrin). Quercetin is one of the most active of the flavonoids. The plant pigment quercetin is a dominant flavonoid found in found mainly in citrus fruit. In the body quercetin has anti-inflammatory activity with direct inhibition of several initial processes of inflammation (it inhibits both the manufacture and release of histamine and other allergic/inflammatory mediators) and it exerts potent antioxidant activity and vitamin C-sparing action. •
As an antioxidant, Quercetin protects LDL ("bad") cholesterol from becoming damaged.
Quercetin blocks an enzyme that leads to accumulation of sorbitol, which has been linked to nerve,
Quercetin helps the eye, kidney and nerves because it blocks an enzyme that leads to accumulation of sorbitol.
Quercetin is the predominant flavonoid found in many fruits and vegetables. Quercetin is a plant pigment and antioxidant that can help protect your eyes from sun damage, it is found in apples and onions are being studied for possible treatment of prostate cancer. Quercetin blocks androgen hormone activity, which has been linked to prostate cancer development and progression. Quercetin works like an antihistamine and has anti-inflammatory properties. Quercetin helps allergies and prevents heart disease. Considered a phytoestrogen and may have antiestrogenic activity.
In Studies: Studies suggest that it may have anti-cancer effects, help prevent heart disease by reducing the oxidation of LDL cholesterol, and act as an antihistamine. It may help treat or even prevent prostate cancer by blocking male hormones that encourage the growth of prostate cancer cells, according to preliminary laboratory research at the Mayo Clinic. A study with men who had an inflamed prostate reported reduced urinary symptoms when they took quercetin.
In population studies people with high intakes of foods containing quercetin and other flavonoids had lower rates of heart disease and lung cancer. Studies have linked a high intake of apples (rich in quercetin) with improved lung function and a lower risk of certain respiratory diseases, such as asthma, bronchitis, and emphysema.
Sources: Apples, onions, raspberries, blueberries, black and green tea, red onions, red wine, red grapes, citrus fruit, cherries, broccoli, spinach and leafy greens
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