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|Vitamin D is normally obtained primarily from sunlight acting on the skin. It is also consumed in the diet in oily fish and milk products. This vitamin is converted first in the liver and then in the kidneys to its active form, calcitriol. Calcitriol acts as a hormone in the body, controlling the absorption of calcium and phosphate from the gut, the levels of calcium and phosphate in the blood and the normal healthy turnover of bone.
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