SynthesisDiabetes & metabolic syndrome
"Vitamin D supplementation and COVID-19 treatment: A systematic review and meta-analysis".
Synthesis in Diabetes & metabolic syndrome. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 60 papers, 17 of them syntheses that pooled it.
What it found
Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.
The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
60 citing papers in PubMed, 17 syntheses or guidelines pooled it.
- Effect of the vitamin D supplementation on clinical outcomes and inflammatory status in COVID-19 patients: an umbrella review.BMC nutrition · 2025Pooled it
- Effect of vitamin D supplementation on COVID-19 outcomes: an umbrella review of systematic reviews.Frontiers in nutrition · 2025Pooled it
- Effect of Vitamin D3 Supplementation on Severe COVID-19: A Meta-Analysis of Randomized Clinical Trials.Nutrients · 2024Pooled it
- Pooled it
- The role of vitamin D in outcomes of critical care in COVID-19 patients: evidence from an umbrella meta-analysis of interventional and observational studies.Public health nutrition · 2024Pooled it
- The impact of supplementing vitamin D through different methods on the prognosis of COVID-19 patients: a systematic review and meta-analysis.Frontiers in nutrition · 2024Pooled it
- Hospital and laboratory outcomes of patients with COVID-19 who received vitamin D supplementation: a systematic review and meta-analysis of randomized controlled trials.Naunyn-Schmiedeberg's archives of pharmacology · 2023Pooled it
- Attitudes and beliefs regarding the use of herbs and supplementary medications with COVID-19: A systematic review.Research in social & administrative pharmacy : RSAP · 2023Pooled it
- Effect of vitamin D supplementation on COVID-19 patients: A systematic review and meta-analysis.Frontiers in nutrition · 2023Pooled it
- Does vitamin D supplementation reduce COVID-19 severity?: a systematic review.QJM : monthly journal of the Association of Physicians · 2022Pooled it
- Serum vitamin D levels and COVID-19 during pregnancy: A systematic review and meta-analysis.Clinical nutrition ESPEN · 2022Pooled it
- Effects of Vitamin D Supplementation on COVID-19 Related Outcomes: A Systematic Review and Meta-Analysis.Nutrients · 2022Pooled it
- The effect of vitamin D supplementation on mortality and intensive care unit admission of COVID-19 patients. A systematic review, meta-analysis and meta-regression.Diabetes/metabolism research and reviews · 2022Pooled it
- Efficacy of Vitamin D Supplements in Treatment of Acute Respiratory Infection: A Meta-Analysis for Randomized Controlled Trials.Nutrients · 2022Pooled it
- Vitamin D supplementation for the treatment of COVID-19: A systematic review and meta-analysis of randomized controlled trials.Frontiers in immunology · 2022Pooled it
- Vitamin D insufficiency is high in Malaysia: A systematic review and meta-analysis of studies on vitamin D status in Malaysia.Frontiers in nutrition · 2022Pooled it
- Vitamin C and COVID-19 treatment: A systematic review and meta-analysis of randomized controlled trials.Diabetes & metabolic syndromePooled it
- Low 1,25-dihydroxyvitamin D levels are associated with severe COVID-19: an observational study in hospitalized patients.Frontiers in nutrition · 2026Article
- Review
- Effect of Moderately High-Dose Vitamin D3 Supplementation on Mortality in Patients Hospitalized for COVID-19 Infection.Nutrients · 2025Article
Corrections and comments
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Authors and funding
6 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
backgroundVitamin-D is an immune-modulator which might be linked to disease severity by SARS-CoV-2.
methodsMeta-analysis of RCTs and quasi-experimental studies, evaluating the role of vitamin-D supplementation in COVID patients was done.
resultsTotal 5 studies (3 RCTs and 2 Quasi-experimental) including n = 467 patients were included. Vitamin D didn't reduce mortality (RR 0.55, 95%CI 0.22 to 1.39, p = 0.21), ICU admission rates (RR 0.20, 95% CI 0.01-4.26, p = 0.3) and need for invasive ventilation (RR 0.24, 95% CI 0.01-7.89, p = 0.42).
conclusionNo significant difference with vitamin-D supplementation on major health related outcomes in COVID-19. Well-designed RCTs are required addressing this topic.
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What OpenQuestion holds
Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.