Abstract
Coronavirus Disease-19 ( COVID-19) is a disease that started at the end of 2019 and continues to affect all the world as a pandemic. There is no definitive cure for COVID-19 yet. The disease is characterized by excessive immune activity, inflammation and coagulopathy. Many agents have been tried for treatment and prevention. Flavonoids are valuable natural food components with antioxidant, anti-inflammatory and anticoagulant properties. Quercetin, the best known flavonoid, is one of the most studied and beneficial one. Quercetin, which has been shown to be effective in many viral diseases, is mainly used in diseases such as cardiovascular disease and diabetes, which are associated with chronic inflammation. it is an important candidate for the treatment and prophylaxis of COVID-19, thanks to its powerful anti-inflammatory, antioxidant and immune-modulating effects.