At May 2020, the press was starting to get news about a possible protective effect of Vitamin D on Coronavirus (aka Covid-19).
Typical was this in WebMD.com: “Several groups of researchers from different countries have found that the sickest patients often have the lowest levels of vitamin D, and that countries with higher death rates had larger numbers of people with vitamin D deficiency than countries with lower death rates.”
By June 2020, more evidence was appearing, but there’s continuing uncertainty about whether Vitamin D is actually effective. This article from the New York Times explains:
“The notion that vitamin D levels could influence the risk of Covid-19 has sparked debate among experts and prompted researchers at Harvard and other universities to start randomized trials examining whether there is a link. But so far, most of the evidence for the claim comes from observational studies that do not prove causation.”
“I think you can learn a lot from observational studies,” said Dr. Meltzer, who is chief of the Section of Hospital Medicine at the University of Chicago Medicine. “But in the end, we desperately need randomized trials to determine as rapidly as we can if there’s a real effect here.”
Meantime, all authorities stress the need to avoid Vitamin D deficiency, not just to possibly protect against Coronavirus, but to fend off a whole range of ailments that can arise.
Link to my post on “Vitamin D”
Link to my post on “Coronavirus”