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. Quercetin has anti-inflammatory and/or anti-histamine activity for the relief of allergic symptoms such as runny nose, sneezing and itchy, watery eyes.