People like the late Bill Sardi and Dr. Joseph Mercola were touting Vitamin D as a preventative of covid back when it all began. They were ignored or censored. From Paul Cullen at irishtimes.com:
Irish researchers find unvaccinated patients with low vitamin D levels are more likely to suffer severe disease and death
Covid-19 patients with low vitamin D levels are more likely to suffer severe disease and death, according to a study by Irish scientists.
Unvaccinated Caucasian adults with low vitamin D have higher mortality due to Sars CoV-2 pneumonia, according to the small-scale study by researchers at Connolly Hospital Blanchardstown and Technological University Dublin. This is not explained by confounders such as age or obesity and is not closely linked to inflammation, they say.
Having an insufficient level of vitamin D was associated with a greater than fourfold increased mortality risk, according to the study, published in the journal Nutrients.
The study looked at the outcomes of 232 unvaccinated patients at Connolly hospital, all of whom had Covid-19 and required supplemental oxygen. Patients on steroid treatment were not recruited for the study in order, the authors say, to eliminate the effect their use might have on measures of both vitamin D and inflammation.