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Vitamin D3 is a fat-soluble vitamin. It is also known as the sunshine vitamin, as the human body can manufacture it when exposed to sunlight.
Studies suggest that cholecalciferol (D3) is the most bioavailable form of vitamin D, which has recently been the subject of renewed interest amongst nutritional scientists. A raft of new studies highlight the importance of vitamin D, not only in its traditional role in bone support, but also in areas including immune and mental health. Vitamin D is unique among essential nutrients, in that it transforms into a hormone in its active form. Like other hormones, it is responsible for regulating certain bodily functions. Once it is produced in the kidney, the active form of vitamin D triggers several essential processes including: mobilisation of calcium and phosphorus from bone tissue, absorption of calcium and phosphorus from food, thyroid and parathyroid function, nerve function and immune function.