Jarrow Formulas Quercetin 500

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Quercetin A Potent Antioxidant Providing Cardiovascular Protection, Reducing Risk For Cancer, Anti-Inflammatory & Anti-Allergic Effects!
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A Potent Antioxidant Providing Cardiovascular Protection!


Quercetin is a flavonol (a subclass of flavonoids) and is a potent antioxidant, providing cardiovascular protection by reducing oxidation of LDL cholesterol. Quercetin is known as a potent antioxidant that helps fight free radicals that can cause cellular damage. Primary sources of quercetin are blueberries, red onions, apples and spinach.It is one-half of the rutin molecule, another flavonol. Quercetin is a more active antioxidant than is rutin and is the most widely consumed flavonoid in the diet.

Quercetin has many health promoting effects


  • Cardiovascular health
  • Reducing risk for cancer
  • Anti-inflammatory
  • Anti-allergic effects
  • All these activities are caused by the strong antioxidant action of quercetin. It will help to combat free radicals molecules, which can damage cells.

As many other flavonoids, quercetin prevents the oxidation of LDL (bad) cholesterol.
The anti-inflammatory action of quercetin is caused by the inhibition of enzymes, such as lipoxygenase, and the inhibition of inflammatory mediators.
Quercetin also inhibits the release of histamine, which causes congestion, by basophils and mast cells.

Quercetin also seems to reduce the production of uric acid, by inhibiting the xanthine oxidase, thereby easing gout symptoms. Studies have shown an improved lung function and lower risk of certain respiratory diseases (asthma and bronchitis) for people with high apple (rich in quercetin) intake.

Quercetin is a plant pigment found in many foods such as onions, apples, berries, tea, grapes and red wine. It's not a nutrient, but is classified as a flavonoid. Once thought to be vitamins, flavonoids were given such names as vitamin P and vitamin C2. Like many other plant chemicals, quercetin is sold as a supplement. Oral quercetin is relatively well absorbed, and it is metabolized mainly to isorhamnetin, tamarixetin and kaempferol.

Primary sources of quercetin are blueberries, red onions, apples and spinach. It is one-half of the rutin molecule, another flavonol. Quercetin is a more active antioxidant than is rutin and is the most widely consumed flavonoid in the diet.

Quercetin often occurs in plants as glycosides, such as Rutin (quercetin rutinoside) in tea. Quercetin and rutin are used in many countries as vasoprotectants and are ingredients of numerous multivitamin preparations and herbal remedies. The average U.S. adult eating a normal, healthy diet consumes about 25 to 50 milligrams of quercetin a day.

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