Vitamin D and Covid-19:

1.  Vitamin D Deficiency as a Predictor of Poor Prognosis in Patients With Acute Respiratory Failure Due to COVID-19. https://pubmed.ncbi.nlm.nih.gov/32772324/

2. Low Plasma 25(OH) Vitamin D Level Is Associated with Increased Risk of COVID-19 Infection: An Israeli Population-Based Study. https://www.medrxiv.org/content/10.1101/2020.07.01.20144329v1

3. Vitamin D Insufficiency is Prevalent in Severe COVID-19   https://www.medrxiv.org/content/10.1101/2020.04.24.20075838v1

4.  Vitamin D Levels Appear To Play Role in COVID-19 Mortality Rates:” Patients with severe deficiency are twice as likely to experience major complications.” https://www.sciencedaily.com/releases/2020/05/200507121353.htm

5. 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. https://pubmed.ncbi.nlm.nih.gov/34684596/

6. Evidence that Vitamin D Could Reduce Risk of COVID-19 Infections and Deaths. Review on the role of Vitamin D in reducing the risk of respiratory tract infections. https://pubmed.ncbi.nlm.nih.gov/32252338/

7. The Role of Vitamin D in Suppressing Cytokine Storm and Mortality in COVID-19. A retrospective review of the relationship between Vitamin D and Covid-19 infection and mortality. https://www.medrxiv.org/content/10.1101/2020.04.08.20058578v4

8.  Vitamin D Insufficiency is Prevalent in Severe COVID-19. Retrospective review. https://www.medrxiv.org/content/10.1101/2020.04.24.20075838v1