Anthocyanins are a group of vegetable dyes belonging to the flavonoids, taking the colour depending on the pH of the cell sap from red to purple. A rich source of anthocyanins are aronia berries, blueberries, raspberries and cranberries. They are powerful antioxidants catching oxygen free radicals. They have important health benefits due to the anti-inflammatory properties (e.g. Cranberries prevent urinary tract infections), strengthen the immunity of the body (e.g. eyesight), prevent sticking together of platelets (so called aggregation), destroy cancer cells. Used in the prevention of the heart and circulatory system diseases (e.g. Chokeberry lowers blood pressure, slows the deposition of atherosclerotic plaques, lowers LDL cholesterol). Dyes are colouring additives, absorbing light and resistant to changes in temperature, for food products and supplements. Due to the ease of oxidation, products containing anthocyanins must be stored in containers that hinder the access of oxygen and at low temperatures. In supplementation, except of fresh fruits, dried fruits are used, in the form of infusions.