A more-studied effect on Vitamin D is that of skin color. This is especially seductive since it’s well-established e.g. Black Americans suffer Covid disproportionately, and also are deficient in Vitamin D disproportionately. But the effect seems to disappear after adjusting for confounders:
The skin color study confirms that vitamin D doesn’t protect against infection. But I don’t see it saying anything clear about how much harm a person suffers if they’re infected.
That’s intriguing. Another news article on Covid/Homeless, I’d love to see more evidence: https://www.latimes.com/california/story/2020-08-21/why-has-covid-spared-l-a-homeless-people
A more-studied effect on Vitamin D is that of skin color. This is especially seductive since it’s well-established e.g. Black Americans suffer Covid disproportionately, and also are deficient in Vitamin D disproportionately. But the effect seems to disappear after adjusting for confounders:
https://www.sciencedirect.com/science/article/pii/S1871402120301156?via%3Dihub#tbl3
The skin color study confirms that vitamin D doesn’t protect against infection. But I don’t see it saying anything clear about how much harm a person suffers if they’re infected.