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When UV light hits the skin, it induces the conversion of 7-dehydrocholesterol, a sterol widely distributed in the skin, into cholecalciferol.
Vitamin D is essential for growth, especially the normal growth and development for bones and teeth in children. Its main function is assisting in many aspects of calcium and phosphorus metabolism, including their intestinal absorption and utilization.
There is also some evidence that Vitamin D functions to improve muscular strength, prevent hypocalcemia (a low blood-calcium level), and enhance the immune system