Multiple randomized trials have suggested that vitamin D supplementation might improve asthma control and reduce severity of asthma attacks. A new meta-analysis bolsters that hypothesis, and may encourage more physicians and people with asthma to consider vitamin D supplements for low vitamin D levels.
In a study in Lancet Respiratory Medicine, authors analyzed the experience of 955 asthma patients previously enrolled in seven randomized controlled trials testing vitamin D versus placebo.
Supplementation with vitamin D was associated with a 50% reduction in asthma attacks severe enough to require hospitalization or emergency department visit (3% vs 6%), compared to placebo. Vitamin D use was also associated with a 30% reduction in asthma attacks necessitating