From the deep, unpolluted waters near Norway, Carlson bring you the finest cod liver oil which is naturally rich in Vitamin A, Vitamin D3, EPA and DHA. 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. Super 1000 mg provides 300% more cod liver oil than other soft gels. THIS PRODUCT is regularly tested using AOAC international protocols for potency and purity by an independent, FDA registered laboratory and found to be free of detectable levels of mercury, cadmium, lead, PCB's and 28 other contaminants.