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Geneticist Steve Jones, formerly a sceptic, says case for doing so is overwhelming....
Of all the vitamins that have been researched, vitamin D is by far the most beneficial to take in supplement form.
A 2008 meta-analysis (a review of a number of studies conducted on the same topic) of 17 randomized controlled trials concluded that it decreased overall mortality in adults. A 2013 meta-analysis of 42 randomized controlled trials came to the same conclusion. In other words, by randomly deciding which participants took the supplement and which didn’t and tightly controlling other variables (thereby reducing the effect of confounding factors), the researchers found that adults who took vitamin D supplements daily lived longer than those who didn’t.
Other research has found that in kids, taking vitamin D supplements can reduce the chance of catching the flu, and that in adults; it can improve bone health and reduce the incidence of fractures.
Of course, even though they’re widely recognized as the best way to test a treatment’s effectiveness, randomized controlled trials have limitations. In this case, the biggest one is that these studies can’t tell us much about the mechanism by which vitamin D seems to reduce mortality or provide other health benefits. Still, given the demonstrated benefits and the fact that it hasn’t been shown to cause any harm, vitamin D might be worth taking as a supplement on a consistent basis.