What is Vitamin D3? Vitamin D is a fat soluble nutrient. Vitamin D is found in Cod liver oil, vitamin D-fortified foods, egg yolks & butter. However, the majority of vitamin D in the body is created during a chemical reaction that starts with sunlight exposure to the skin. Cholecalciferol (vitamin D3) is the animal form of this vitamin, though our product is synthetic making it suitable for both vegans & vegetarians. What Does Vitamin D3 Do? Vitamin D contributes to: • the maintenance of normal bone & teeth • normal absorption & utilisation of calcium & phosphorus & the maintenance of normal blood calcium concentrations • normal cell division • normal function of the immune system & healthy inflammatory response • the maintenance of normal muscle function