Summary Vitamin D has many protective properties and potential role against acute lung injury. Low serum vitamin D is associated with high risk of pneumonia and development of acute respiratory distress syndrome. This study sought to analyse the efficacy of vitamin D in improving the outcomes of coronavirus disease 2019 (Covid‐19) patients. Using specific keywords, we comprehensively searched the potential articles on PubMed, Europe PMC and ClinicalTrials.gov database until 8th May 2021. All published studies on Covid‐19 and vitamin D were retrieved. Statistical analysis was conducted using Review Manager 5.4 software. A total of 11 studies with 22,265 Covid‐19 patients were included in the meta‐analysis. Our data suggested that vitamin D supplementation was associated with reduction in intensive care unit admission rate (OR 0.27; 95% CI: 0.09–0.76, p = 0.010, I 2 = 70%, random‐effect modelling); reduction of the need for mechanical ventilation (OR 0.34; 95% CI: 0.16–0.72, p = 0.005, I 2 = 61%, random‐effect modelling) and reduction of mortality from Covid‐19 (OR 0.37; 95% CI: 0.21–0.66, p < 0.001, I 2 = 50%, random‐effect modelling). Further analysis showed that the associations were influenced by age ( p = 0.020). Our study suggests that vitamin D supplementation may offer beneficial effects on Covid‐19 outcomes. However, more randomized clinical trials are required to confirm this conclusion.

Aims GLP-1RA has many beneficial properties, including anti-inflammatory, anti-obesogenic, pulmonary protective effects as well as beneficial impact on gut microbiome. However, the evidence regarding the benefit of GLP-1RA in Covid-19 patients with diabetes is still unclear. This study sought to analyze the benefit of pre-admission use of GLP-1RA in altering the mortality outcomes of coronavirus disease 2019 (Covid-19) patients with diabetes mellitus. Methods Using specific keywords, we comprehensively searched the potential articles on PubMed, Europe PMC, and medRxiv database until June 12 th , 2021. All published studies on Covid-19 and GLP-1RA were retrieved. Statistical analysis was conducted using Review Manager 5.4 and Comprehensive Meta-Analysis version 3 software. Results A total of 9 studies with 19,660 diabetes mellitus patients who were infected by SARS-CoV-2 were included in the meta-analysis. Our data suggested that pre-admission use of GLP-1RA was associated with reduction in mortality rate from Covid-19 in patients with diabetes mellitus (OR 0.53; 95%CI: 0.43 – 0.66, p <0.00001, I 2 = 0%, random-effect modelling). Further analysis showed that the associations were not influenced by age ( p =0.213), gender (p=0.421), hypertension (p=0.131), cardiovascular disease (p=0.293), nor the use of metformin (p=0.189) and insulin (p=0.117). Conclusions Our study suggests that pre-admission use of GLP-1RA may offer beneficial effects on Covid-19 mortality in patients with diabetes mellitus. However, more randomized clinical trials are required to confirm this conclusion.

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Background: Hypertension and heart failure are known risk factors for coronavirus disease 2019 (COVID-19) severity and mortality outcomes. Beta-blocker is one of the drugs of choice to treat these conditions. The purpose of this study is to explore the relationship between pre-admission beta-blocker use and COVID-19 outcomes. Methods: PubMed and Europe PMC were used as the database for our search strategy by using combined keywords related to our aims until December 10th, 2020. All articles related to COVID-19 and beta-blocker were retrieved. Review Manager 5.4 and Comprehensive Meta-Analysis 3 software were used to perform statistical analysis. Results: A total of 43 studies consisting of 11,388,556 patients were included in our analysis. Our meta-analysis showed that the use of beta-blocker was associated with increased risk of COVID-19 [OR 1.32 (95% CI 1.02 – 1.70), p = 0.03, I2 = 99%, random-effect modelling], clinical progression [OR 1.37 (95% CI 1.01 – 1.88), p = 0.04, I2 = 89%, random-effect modelling], and mortality from COVID-19 [OR 1.64 (95% CI 1.22 – 2.19), p = 0.0009, I2 = 94%, random-effect modelling]. Meta-regression showed that the association with mortality outcome were influenced by age (p = 0.018) and hypertension (p = 0.005). Conclusions: The risk and benefits of using beta-blocker as a drug of choice to treat hypertensive patients should be put into account and reviewed individually case by case, knowing their association in higher incidence and severity of Covid-19 infections. Other first-line antihypertensive drugs may be considered as an alternative therapy if the risk of administering beta blockers outweigh the benefits in Covid-19 infection.

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