People still don’t get it: Vitamin D is the “miracle nutrient” that activates your immune system to defend you against invading microorganisms — including seasonal flu and swine flu. Two months ago, an important study was published by researchers at Oregon State University. This study reveals something startling: Vitamin D is so crucial to the functioning of your immune system that the ability of vitamin D to boost immune function and destroy invading microorganisms has been conserved in the genome for over 60 million years of evolution.

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