Randomized trial of vitamin D supplementation to prevent seasonal influenza A in schoolchildren.
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Link to full study
http://www.ncbi.nlm.nih.gov/pubmed/20219962
Conclusion of this study
This study suggests that vitamin D(3) supplementation during the winter may reduce the incidence of influenza A, especially in specific subgroups of schoolchildren. This trial was registered at https://center.umin.ac.jp as UMIN000001373.
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