https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7597430
J Nutr Health Aging. 2020; 24(9): 1038–1039.
Please read this letter to the editor from June, 2020 summarizing the research on vitamin D levels and outcomes from Covid19. Sufficient blood levels appear to be a critical factor on progression of disease. A further search on pubmed.gov will bring up a dozen other research papers on the value of vitamin D especially pertaining to Covid19. Deficiencies are common in the winter. If you haven’t had a recent test ask your doctor for one or call me for other means.