GNC Cod Liver Oil supplies a significant amount of Vitamin A, D and Vitamin E. GNC Cod Liver Oil has triple the EPA and DHA content of our regular cod liver oil capsules. Cod liver is a natural source of: Vitamin A which is essential for normal vision. Vitamin D which is necessary for healthy teeth and bones. Omega-3 fatty acids help support the cardiovascular system. This product is regularly tested using Association of Official Analytical Chemists (AOAC) international protocol for potency and purity by an independent, FDA–registered laboratory and found to be free of detectable levels of mercury, cadmium, lead and PCBs.