The trial appears in the March, 2010 issue of the American Journal of Clinical Nutrition (Am J Clin Nutr (March 10, 2010). doi:10.3945/ajcn.2009.29094)
The results are from a randomized, double-blind, placebo-controlled study involving 334 children, half of which were given 1200 IUs per day of vitamin D3. In other words, this was a "rigorous" scientific study meeting the gold standard of scientific evidence.
This means vitamin D appears to be 800% more effective than vaccines at preventing influenza infections in children.
Please stock up on Vitamin D and C - I take 5000 mg per day in the winter and kids should take 1200 mg per day.
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