Vitamin D may not be as protective against Covid-19 as previously thought

If you need some background on Vitamin D, its mechanisms, effects and some thoughts on the evidence, I suggest reading my wife's series on it (she was on here previously, parathyroid surgeon who deals with calcium and therefore Vitamin D):

https://www.devaboone.com/post/vitamin-d-part-1-back-to-basi...

https://www.devaboone.com/post/vitamin-d-part-2-shannon-s-st...

https://www.devaboone.com/post/vitamin-d-part-3-the-evidence

Current versions of the cited preprints:

https://www.medrxiv.org/content/10.1101/2021.03.04.21252885v...

https://www.medrxiv.org/content/10.1101/2020.09.08.20190975v...