Is it better to take vitamin d every day or once a week?

How much vitamin D do we really need to preserve healthy bones and overall health? Do higher levels of vitamin D supplementation, as some studies suggest, reduce the risk of cardiovascular disease, cancer, diabetes, autoimmune disorders, and respiratory infections?

Or is the evidence still too limited?

With the use of vitamin D supplements and testing for vitamin D levels now common practice for many in the U.S. and other developed nations, an expert panel established by the Endocrine Society and co-chaired by faculty at Tufts University School of Medicine set out to examine existing high-quality research on the issue to update recommendations, which had not been reviewed by the Endocrine Society in more than a decade. 

After four years of study, the panel released new guidelines earlier this year that begin to fine-tune our understanding of how much vitamin D people at different ages and stages of their lives need to consume daily, what effects it may have on preventing disease, and whether people should have th

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