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READING CHALLENGE 1 QUESTION 3

 3.VITAMIN D


Vitamin D is a group of fat soluble vitamins responsible for intestinal absorption of calcium and phosphate.Two major forms of vitamin D exist. Vitamin D2 (ergocalciferol), found in plants, is produced by ultraviolet B irradiation of ergosterol and can be consumed as a supplement or in fortified foods. Vitamin D3 (cholecalciferol), on the other hand, a product of ultraviolet B irradiation of 7-dehydrocholesterol, is synthesised in the human epidermis or consumed in the form of natural (for example, fish) or fortified food sources or as a supplement. Supplementation with vitamin D has been shown to benefit skeletal conditions such as rickets, fractures, and falls,although a similar effect on bone mineral density was not evident in a recent review of trials.A growing body of evidence indicates that vitamin D may reduce risks of a wide range of diseases including multiple sclerosis, autoimmune disorders, infections, and cardiometabolic and cancer outcomes,indicating a possible pleiotropic effect across extraskeletal systems. However, the evidence for vitamin D reducing the risk of non-skeletal diseases is still being debated.



3.The purpose of this paragraph is s



A  to discribe about types of vitamin D

B.  to inform about the negetive aspects of vit D suppliments

C  how vitamin D is produced in epidermis.


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