Q: Should you take a vitamin D supplement to protect against #COVID19?
A: We have essentially no idea, because the evidence is terriblehttps://medium.com/the-method/should-you-take-a-vitamin-d-supplement-for-covid-19-63d922f24953 …
Those are relative reductions - they also calculated the NNT from which you can derive the absolute risk reduction of 3%
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"Approximately 30% of the UK population is estimated to be vitamin D deficient in winter and spring (4) – in this group the NNT with daily/weekly vitamin D supplementation to prevent one ARI falls to four. This represents a large protective effect by any standards."
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