Quercetin is one of the flavonoids, water-soluable plant pigments commonly known for their antioxidant activity. Studies have shown that quercetin is consistently the most active of the flavonoids, and is found in high concentrations in many medicinal plants. Research suggests that quercetin may be particularly useful in the prevention of cancer. Quercetin has been used therapeutically for a wide range of allergic and inflammatory conditions, including respiratory conditions such as asthma and bronchitis.
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