>after that abstract I'm not sure I want to check out the details
There's a fairly short review of why the study is kinda silly here: https://gidmk.medium.com/vitamin-d-covid-19-and-the-promise-...
There's a fairly short review of why the study is kinda silly here: https://gidmk.medium.com/vitamin-d-covid-19-and-the-promise-...
And the science involved is quite complex as recent studies have suggested that people can become resistant to Vitamin D in a way that mirrors insulin sensitivity. This means that serum levels vary in ways that are very much not directly related to supplementation, especially dietary supplementation.
In any case getting distracted by the "Regression SUGGESTED a THEORETICAL zero point of mortality ..." remark doesn't make sense because even Vitamin D enthusiasts rarely sustain levels much above 40.