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Vitamin D is one of the fat soluble vitamins. There are a few forms of Vitamin D, including Ergocalciferol (D2) and Cholecalciferol (D3). Recent data has shown that D3-Cholecalciferol is the most beneficial and has the highest bio-efficacy in the body. It is produced naturally in the skin and stored in the liver of many animals. Hence, why liver, cod liver oil and oily fish are great source of D3. Vitamin D can also be produced inside the body as well as consumed. However countries such as the UK do not have the right amount of sunshine all-year-round to provide this ability consistently. Dietary sources of Vitamin D include, cod liver oils, sardines, salmon, sunflower seeds, eggs and cheese. The role of Vitamin D is mainly in the maintenance of sufficient calcium levels in the blood and bone. By having adequate Vitamin D, and thus calcium in the body it can contribute to the health of teeth, bones, and muscular contraction. Vitamin D has also been linked with improved immune and inflammatory responses.