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Original paper here https://papers.ssrn.com/sol3/papers.cfm?abstract_id=3771318

Not yet peer reviewed, but this appears to be undeniable proof of vitamin D's efficacy re Covid, and any further inaction by governments strikes me as criminal negligence.

Comments from the /r/COVID19 subreddit are usually pretty good:

https://www.reddit.com/r/COVID19/comments/lj9o0o/comment/gna...

> The public health bar for officials to start recommending the use of vitamin D (and its analogs) for covid19 should not be the bar for novel pharmaceutical drug approval but should be that the expect benefit outweighs the expect harm, which is clearly has for some time and this adds to the amount by which expected benefit outpaces expected harm even if the study is imperfect.

Original (non-paywalled) link that you gave would be better than the Telegraph article; thanks for that.

I have read elsewhere that Spain has a high rate of vitamin-D deficiency (https://www.researchgate.net/publication/49703062_Vitamin_D_...), especially among the elderly. What works in Spain may not work elsewhere, depending on vitamin D levels. But it seems pretty easy to at least make a check for vitamin D deficiency part of the standard treatment for covid-19.