The total number of publications that mention vitamin D is more than 93,600. A simple search at pubmed.gov shows there were 5484 publications in 2021 with vitamin D in the title or abstract. That is up from 4548 in 2020. In 2021, 609 of the publications with vitamin D in the title or abstract in 2021 were about COVID-19, and 279 about SARS-CoV-2. Read more.