From the deep, unpolluted waters near Norway, Carlson Norwegian Cod Liver Oil is the finest cod liver oil on the market. Rich in Omega 3 and vitamins A & D Contains DHA & EPA for brain and heart health No added flavour Regularly tested for purity, potency and freshness Only cod fish caught during the winter and early spring are used, as the liver oil content is highest at this time of year. The oil is separated from the liver tissues without the use of chemicals. To ensure freshness of Carlson Norwegian Cod Liver Oil, the air inside the glass bottle has been replaced with nitrogen. This product is regularly tested (using AOAC international protocols) for freshness, potency and purity by an independent, FDA-registered laboratory and has been determined to be fresh, fully potent and free of detrimental levels of mercury, cadmium, lead, PCB's and 28 other contaminants.