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Health

Vitamin D & influenza - randomized trial

Gene ExpressionBy Razib KhanMarch 15, 2010 2:56 PM

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Randomized trial of vitamin D supplementation to prevent seasonal influenza A in schoolchildren:

Design: From December 2008 through March 2009, we conducted a randomized, double-blind, placebo-controlled trial comparing vitamin D3 supplements (1200 IU/d) with placebo in schoolchildren. The primary outcome was the incidence of influenza A, diagnosed with influenza antigen testing with a nasopharyngeal swab specimen. Results: 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 [relative risk (RR), 0.58; 95% CI: 0.34, 0.99; P = 0.04]. The reduction in influenza A was more prominent in children who had not been taking other vitamin D supplements (RR: 0.36; 95% CI: 0.17, 0.79; P = 0.006) and who started nursery school after age 3 y (RR: 0.36; 95% CI: 0.17, 0.78; P = 0.005). In children with a previous diagnosis of asthma, asthma attacks as a secondary outcome occurred in 2 children receiving vitamin D3 compared with 12 children receiving placebo (RR: 0.17; 95% CI: 0.04, 0.73; P = 0.006).

I will attest to improvement in my own respiratory health since I began taking vitamin D supplements in 2007, but more studies need to be done to confirm that this is a robust finding. Citation: Am J Clin Nutr (March 10, 2010). doi:10.3945/ajcn.2009.29094

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