Taking vitamin D could reduce risk of COVID-19 infections and death.
To reduce the risk of infection, it is recommended that people at risk of influenza and/or COVID-19 consider taking 10,000 IU/d of vitamin D3 for a few weeks to rapidly raise 25(OH)D concentrations, followed by 5000 IU/d.
https://pubmed.ncbi.nlm.nih.gov/32252338/
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