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Quercetin is the most abundant flavonoid and one of the most important antioxidant of plant origin. The aim of the review was to describe quercetin and its role in the prevention and treatment of diseases. Articles were searched from internet databases using the following search words; quercetin, oxidative stress, quercetin and liver disease, quercetin and kidney disease, quercetin and hyperglycemia. The articles that met the selection criteria were used to describe quercetin and its role in the prevention and treatment of different diseases. The result showed that flavonoids are generally found at higher concentrations in outer layers of fruits and vegetables, onion has more quercetin than blackcurrants, broccoli, black grapes and apple. Quercetin and quercetin rich diets are used in the treatment and prevention of hyperglycemia, cardiovascular and kidney diseases, liver damage and nervous system disorders. In conclusion, quercetin is a naturally occurring flavonoid, more abundant in fruits and vegetables and are used in the treatment and prevention of many diseases.

Role of quercetin in the prevention and treatment of diseases: Mini review