Review of the Benefits of Vitamin D and Recommendations

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'Scientifically, several ways exist to gauge vitamin D’s effects. Because solar UVB exposure is the main source of vitamin D for most people, studies of health outcomes and disease rates related to solar UVB doses are useful. Ecological studies offer one way to study how solar UVB affects health outcomes. 

In geographical ecological studies, researchers statistically compare average solar UVB doses with health outcomes for populations in geographically defined areas, such as states. Other disease risk–modifying factors also are included in such analyses. Such studies have helped to identify cancers for which UVB exposure and vitamin D reduce risk.'

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