Dr. Ian Smith explains quercetin is a flavonoid or plant chemical found in most fruits and vegetables that cause fruits and veggies to have color. There have been claims it can be used as an adjunct treatment for the virus, but Dr. Ian warns these claims are very new and have yet to be tested in extensive clinical trials.
Apples, citrus fruits, red grapes, cherries, onions, capers, green leafy vegetables, honey, and green tea are all high in the plant chemical, which is an antioxidant and is anti-inflammatory. Quercetin may also help control blood sugar levels and fight against heart disease.
Dr. Ian stresses the best way to get more quercetin is to just eat more fruits and veggies, instead of taking a supplement.