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Quercetin is a chemical found naturally in a number of foods (including apples, onions, teas, berries, and red wine) and in some herbs (such as ginkgo biloba and St. John's wort). Quercetin acts as an antioxidant, scavenging free radicals (chemical by-products known to harm cell membranes and damage DNA).
Apples and onions are excellent sources of quercetin. Some studies show that people who eat a lot of apples have improved lung function and reduced risk of lung conditions. Other good sources include: berries, cabbage, cauliflower, nuts (not peanuts), and black, green, or white tea.