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The National Academies of Science, Engineering and Medicine recommends that most adults get about 600 international units of vitamin D per day through food or supplements, increasing that dose to 800 IUs per day for those 70 or older. essgee51/Flickr hide caption

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A Bit More Vitamin D Might Help Prevent Colds And Flu

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Peruvian anchoveta being processed at a fish meal factory in Lima in 2009. The small forage species has been heavily fished. Ernesto Benavides/AFP/Getty Images hide caption

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Ernesto Benavides/AFP/Getty Images

A fisherman pulls a basket filled with anchovies aboard a fishing boat off of Peru's northern port of Chimbote, in 2012. Peru is the world's top fishmeal exporter, producing about a third of worldwide supply. Enrique Castro-Mendivil/Reuters/Landov hide caption

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Enrique Castro-Mendivil/Reuters/Landov