Another study shows a link between healthy blood levels of vitamin D and significantly lower risk of severe COVID. 'Vitamin D sufficiency, a serum 25-hydroxyvitamin D at least 30 ng/mL (75 nmol/L) reduced risk for adverse clinical outcomes in patients with COVID-19 infection' https://pubmed.ncbi.nlm.nih.gov/32976513/
Vitamin D sufficiency, a serum 25-hydroxyvitamin D at least 30 ng/mL reduced risk for adverse clinical outcomes in patients with COVID-19 infection - PubMed
Therefore, it is recommended that improving vitamin D status in the general population and in particular hospitalized patients has a potential benefit in reducing the severity of morbidities and mortality…
pubmed.ncbi.nlm.nih.gov