Biological Effects of Quercetin in COPD Phase II

This study is testing whether quercetin — a natural compound found in fruits and vegetables — can reduce inflammation in people with chronic obstructive pulmonary disease (COPD), a lung condition that makes it hard to breathe. **You may be eligible if:** - You are between 40 and 80 years old - You have been diagnosed with COPD - You are a current or former smoker with at least 10 pack-years of smoking history - Your lung function tests show moderate COPD **You may NOT be eligible if:** - You are allergic to quercetin - Your primary diagnosis is asthma (not COPD) - You had a respiratory infection or were hospitalized in the past month - You take warfarin or cyclosporine - You consume more than 150 mg of quercetin daily from food or supplements - You have inflammatory bowel disease or a history of lung cancer - You are pregnant, nursing, or of childbearing age and unwilling to use contraception Talk to your doctor to see if this trial is right for you.