The title of a major meta-analysis study published in October 2021 is “COVID-19 Mortality Risk Correlates Inversely with Vitamin D3 Status, and a Mortality Rate Close to Zero Could Theoretically Be Achieved at 50 ng/mL 25(OH)D3: Results of a Systematic Review and Meta-Analysis,” and that title pretty much says it all [147]. Yet the NIH treatment guidelines found on their website in May 2022, state that: Recommendation: There is insufficient evidence to recommend either for or against the use of Vitamin D for the prevention or treatment of COVID-19.
