If you don’t get out in the sun, live north of 35º latitude, use lots of sunscreen, have dark skin, or are well aged you are likely to be vitamin D deficient. And it’s not just rickets; there are a lot of other illnesses that correlate with vitamin D deficiency, including viral illnesses, multiple sclerosis, tuberculosis, eclampsia, senility, and cancers.
It is important that you and your loved ones take vitamin D supplements and have blood tests to determine your level of circulating vitamin D.
How much is enough? Dr John Campbell interviews professor Dr David Grimes about the benefits and the dosing of vitamin D.
Scico 
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