Effectiveness and Safety of Two Vitamin D3 Supplementation Regimens in Adults with Early-stage COVID-19

This study aimed to determine the effectiveness and safety of individualized vitamin D3 supplementation in adult patients with early-stage severe COVID-19. The goal was to see if vitamin D3 could reduce the risk of progressing to critical COVID-19, characterized by severe respiratory distress and other life-threatening complications. The research question was: What is the effect of vitamin D3 on serum calcidiol levels during the active phase of the disease in adult patients with COVID-19? The study hypothesized that an accelerated vitamin D3 supplementation regimen in adult patients with COVID-19 would achieve the ideal serum calcidiol level (40-60 ng/ml) during the active phase of the disease. This was a randomized controlled clinical trial with two parallel groups. The first group, the accelerated supplementation group, received a single monthly dose of vitamin D3, while the second group, the daily supplementation group, received a daily dose of vitamin D3 during their hospital stay. A total of 216 patients were included in the study and were randomly assigned to one of the two groups. Key procedures and measurements included the collection of three blood samples from each patient during their hospital stay-at admission (day 1), on day 7, and on day 14. Biomarker analysis measured serum levels of vitamin D3, Von Willebrand Factor, interleukin-6 (IL-6), and glutathione peroxidase. Clinical monitoring was conducted to track the development of critical COVID-19, the need for mechanical ventilation, and overall clinical outcomes, such as recovery or death. The importance of this study lay in the role of vitamin D3 in immune regulation, as it had been identified as a protective factor against severe respiratory infections. By determining the optimal supplementation strategy, this study hoped to improve clinical outcomes for COVID-19 patients, reduce mortality rates, and prevent the progression to critical illness. Inclusion criteria for the study were adult patient