Ongoing randomised controlled trials on the effect of vitamin D supplement on the secondary prevention of acute wheeze in preschool and school-age children
| Author | ClinicalTrials.gov Identifier | Setting | Age range (years) | Phenotype of asthma (n) | Oral vitamin D3 dose (IU) | Primary outcome measure | Expected completion date | Comment |
| Ducharme et al 74 | NCT03365687 | Canada | 1–5 | Viral-induced wheeze (865) | 100 000 at baseline and at 3.5 months with a daily dose of 400 for 7 months for 7 months | Number of asthma attacks treated with oral corticosteroid | December 2022 | – |
| Placebo | ||||||||
| Celedon et al 75 | NCT02687815 | USA | 6–16 | Asthma treated with inhaled corticosteroids and 25(OH)D <75 nmol/L (400) | 4000/day for 48 weeks | Number of asthma attacks requiring systemic corticosteroids, or an increase in maintenance dose for at least 3 days or an unplanned healthcare visit due to asthma | November 2020 | Trial has been stopped |
| Placebo |