Our unrefined Cod Liver Oil is a rich source of natural vitamin A, vitamin D, and the essential fatty acids: linoleic, linolenic, arachidonic, eicosapentaenoic (EPA), and docosahexaenoic (DHA) acids. These nutrients are critical for normal metabolism, brain and nerve function, and protecting and building the immune system. EPA and DHA are long-chain, omega-3 fatty acids found in cold-water fish and marine mammals that support a healthy cardiovascular system. Nutritionists recommend supplementing the diet with a small amount of cod liver oil, especially during the winter months, to ensure adequate dietary intake of vitamins A and D.* Our Cod Liver Oil uses natural Norwegian cod liver oil derived from fish caught in open waters in the North Atlantic Ocean away from sites of industrial pollution. In order to ensure that our Cod Liver Oil is safe for consumption, we routinely use an independent laboratory to test for heavy metals and environmental contaminants (such as organochlorides). Our oil is processed without the use of chemicals or heat. We purposely leave it unrefined, so it retains the natural balance of vitamins and fatty acids. We are NOT interested in refining out its natural "fishy" taste and smell at the expense of the natural nutritional content and balance.