A powerhouse of fat-soluble nutrition - Vitamins A & D and long-chain omega-3 fatty acids: EPA and DHA. These nutrients are critical for normal metabolism, brain and nerve function, protecting and building the immune system. Anti inflammatory. Good for the skin. How to keep it from getting rancid? Vitamin E - 1000 parts per million (0.1%) Filled to the top so there is not enough area for oxygen to gin in to make it rancid. Our Cod Liver Oil is by Molecular Distillation - a process primarily used to concentrate omega-3 fatty acids (EPA and DHA) in fi sh oil, and remove contaminants. It is refi ned at a very low temperature. There is some natural A & D however, we have had to add some to it in order to meet the daily allowance. The D is D3 Cholecaliferol and the A is retinyl palmitate.