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1. Introduction Initially classified as a vitamin in the 20th century, vitamin D is now understood to be a prohormone. Vitamin D2 (ergocalciferol) and vitamin D3 (cholecalciferol) are the two main forms of vitamin D [1]. Vitamin D’s function as an immune system regulator has been studied more lately. Enhancing innate immunity and bolstering the adaptive immune system are two major functions of vitamin D [2].
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