2. Phase II Study of a Standardized Quercetin-rich Apple Extract for Chemoprevention of Lung Cancer. Background / scienceProposed study design and methodology. 3. Background: what is quercetin?. Quercetin is a type of polyphenol belonging to the flavonoid class. Over 4,000 flavonoids -- and twice as many polyphenols -- have been identified; they are widespread constituents of many plant foods, including fruits, vegetables, grains, chocolate, tea and wine. .
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