"Vitamin D boosts immunity by stimulating production of cathelicidin, an antimicrobial protein that serves as a "natural antibiotic" in the body, says Michael Zasloff, a professor of surgery and pediatrics at Georgetown University Medical Center in Washington, D.C.
But so far studies looking directly at whether higher vitamin D levels help prevent upper respiratory infections have had mixed results."
http://online.wsj.com/article/SB10001424052748704156304576003531437073192.html?mod=dist_smartbrief
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