Vitamin D Insufficiency is Prevalent in Severe Covid-19
From a few days ago: https://news.ycombinator.com/item?id=23086211There is strong evidence that Vitamin D does nothing. Large scale studies of vitamin D supplements show no benefit.The article above argues that it is actually sun exposure that brings health benefits, and that vitamin D is just a byproduct. This makes sense. If vitamin D levels are strongly correlated with good health, it doesn't mean that it causes it. There might be some third factor.