Quercetin is a naturally occurring nutrient with all the properties of an antioxidant (flavonoid). It strengthens the body's natural defences, relieves food intolerances and helps to control all types of allergies, improving general well-being. The French company Vit'all has developed this 100% vegetable dietary supplement present in purple onions, red fruits, broccoli and black tea, among others. In addition, it calms the reaction of solar hypersensitivity, reduces inflammation and the risk of neurological diseases. In cardiovascular affections, it lowers blood pressure, improves the health of heart cells and facilitates circulation. It should only be used by adolescents and adults; in pregnant or breastfeeding women, medical advice is required. Keep out of the reach of children. Food supplements are not a substitute for a balanced diet and a healthy lifestyle.