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

"This pilot clinical study administered and compared daily and bolus vitamin D dosing regimens to achieve and maintain optimal serum 25(OH)D levels in patients with COVID-19. The daily dose group received constant cholecalciferol supplementation (vitamin D supplementation), aimed at achieving more stable and non-peak 25(OH)D levels. In contrast, the bolus group received a one-month cumulative monthly dose, divided into 4 doses, administered on 4 consecutive days, which could result in rapid increases followed by gradual decreases in 25(OH)D levels. The daily dose of cholecalciferol was calculated using the following formula: Daily dose of cholecalciferol = \[Weight (kg) × desired increase in 25(OH)D (ng/ml) × 2.5\] - 10 .~Bolus dose = (daily dose)(30 days)/4 doses"