vit D reduces flu risk

2. • https://www.ncbi.nlm.nih.gov/pmc/articles/PMC44
63890/
• https://www.ncbi.nlm.nih.gov/pmc/articles/PMC61
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• https://news.harvard.edu/gazette/story/2017/02/s
tudy-confirms-vitamin-d-protects-against-cold-and-
flu/
• https://journals.lww.com/pidj/Fulltext/2018/08000
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• https://www.sciencedaily.com/releases/2017/02/1
70216110002.htm