For the first time, probably, the effect of Vitamin D on seasonal influenza has been studied in a controlled randomized trial. In a recent Japanese study, school children were given 1200 IU of Vitamin D3 daily, or a placebo, during the winter, from December 2008 through March 2009. Influenza A occurred in 18 of 167 (10.8%) children in the vitamin D3 group compared with 31 of 167 (18.6%) children in the placebo group.
We are still waiting for the results of a study launched by The Public Health Agency of Canada (PHAC), where the the role of vitamin D in protection against swine flu, is studied. As far as I can see, there is no information available about this study at the PHAC web site or that of the McMaster University, and the only information available is that in a letter sent to NutraIngredients-USA in August 2009.
Update: Dr Briffa; Vitamin D supplementation found to help prevent flu in children
Image: Early Stories