Nature's Harbor Cod Liver Oil is an excellent source of Vitamins A and D and Omega-3 fatty acids. Fatty acids are a necessary part of our diet to help improve heart and circulatory health, aid in the prevention of arthritis and diabetes, and lower triglyceride levels. Vitamin A is most commonly known as a beneficial nutrient for better vision, improved night vision, and as protection against the formation of cataracts. Vitamin A also plays an essential role in developing healthy skin, teeth, and bones. Vitamin D regulates normal blood levels of calcium and phosphorus to promote strong teeth and bones.