Quercetin is a plant flavonoid that is commonly found in a variety of fruits, vegetables, leaves, and grains. Known for its antioxidant properties, quercetin helps to combat oxidative stress in the body by neutralizing free radicals. It is often studied for its potential health benefits, which include anti-inflammatory effects, immune system support, and cardiovascular health improvements. Foods rich in quercetin include apples, onions, berries, and tea. Additionally, quercetin is available as a dietary supplement and is sometimes used to manage conditions such as allergies, high blood pressure, and certain chronic diseases. Despite its promising benefits, it is important to consult a healthcare provider before starting any new supplement regimen.