I have a PhD in immunology and this is how I keep my daughter from getting sick during the winter

Business Insider Nov 2019

Vitamin D,   Omega-3,   Probiotics,   Tumeric,   Elderberry

Note: The first 4 items have been proven to increased the amount of Vitamin D which gets to the cells

See also VitaminDWiki

Flu has the following

Vitamin D fights all phases of Influenza

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