Herbs of Gold Quercetin Complex 60tIndications Quercetin has natural anti histamine properties. Quercetin provides symptomatic relief of upper respiratory tract allergies. Bioflavonoids help to increase the absorption and utilisation of vitamin C. Bioflavonoids refer to a group of (antioxidant) compounds and includes quercetin, rutin and hesperidin. Vitamin C and flavonoids such as quercetin rutin and hesperidin are potent antioxidants. Helps maintain capillary strength and health.