BACKGROUND: Vitamin D is a likely candidate for treatment as its immune modulating characteristics have effects on coronavirus disease 2019 (COVID-19) patients. It was sought herein, to summarize the studies published to date regarding the vitamin D supplementation to treat severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) positive patients. METHODS: A systematic review and meta-analysis were performed following Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) statement. The primary outcome were 14-day and in-hospital mortality reported as an odds ratio (OR) with the associated 95% confidence interval (CI). RESULTS: Eight articles were included in the review with a combined total of 2,322 individual patients, 786 in the vitamin D supplementation group and 1,536 in the control group. The use of vitamin D compared to the group without vitamin D supplementation was associated with a lower 14-day mortality (18.8% vs. 31.3%, respectively; OR = 0.51; 95% CI: 0.12-2.19; p = 0.36), a lower in-hospital mortality (5.6% vs. 16.1%; OR = 0.56; 95% CI: 0.23-1.37; I2 = 74%; p = 0.20), the rarer intensive care unit admission (6.4% vs. 23.4%; OR = 0.19; 95% CI: 0.06-0.54; I2 = 77%; p = 0.002) as well as rarer mechanical ventilation (6.5% vs. 18.9%; OR = 0.36; 95% CI: 0.16-0.80; I2 = 0.48; p = 0.01). CONCLUSIONS: Vitamin D supplementation in SARS-CoV-2 positive patients has the potential to positively impact patients with both mild and severe symptoms. As several high-quality randomized control studies have demonstrated a benefit in hospital mortality, vitamin D should be considered a supplemental therapy of strong interest. Should vitamin D prove to reduce hospitalization rates and symptoms outside of the hospital setting, the cost and benefit to global pandemic mitigation efforts would be substantial.

1st Chair and Department of Cardiology Medical University of Warsaw Poland

1st Department of Cardiology Medical University of Gdansk Poland

College of Rehabiliation Warsaw Poland

Department of Emergency Medical Service Wroclaw Medical University Wroclaw Poland

Department of Surgery The Silesian Hospital in Opava Czech Republic

Emergency Medical Service and Medical Transport Dispatcher Warsaw Poland

Henry JN Taub Department of Emergency Medicine Baylor College of Medicine Houston TX United States

Institute of Outcomes Research Maria Sklodowska Curie Medical Academy Warsaw Poland

Institute of Outcomes Research Polonia University Czestochowa Poland

International European University Kiev Ukraine

Jan Kochanowski University Kielce Poland

Laboratory of Experimental Clinical Chemistry Amsterdam University Medical Center Amsterdam the Netherlands

Maria Sklodowska Curie Bialystok Oncology Center Bialystok Poland

Outcomes Research Unit Polish Society of Disaster Medicine Warsaw Poland

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