Purity, Freshness - 3rd Party Tested Medium to Large Breed Dogs Pure Omega-3 Oil Supplement (With Naturally Occurring Vitamin A) Wild Arctic Cod Liver Oil For Optimal Pet Health and Wellness Distilled for Purity Sustainable Fishing Nordic Naturals' exceptional quality cod liver oil is derived exclusively from wild Arctic cod. Important omega-3 fatty acids, EPA and DHA, help support healthy skin, coat, joints, heart and the development and maintenance of the brain and eyes. All natural vitamin A helps support vision and immune function. Nordic Naturals oils are distilled for purity, and surpass the strict international standards for purity and freshness (European Pharmacopoeia and World Health Organization).Nordic Naturals