Effect of vitamin D supplementation on asthma control in patients with vitamin D deficiency: the ACVID randomised clinical trial

This study in adults with asthma and serum 25-hydroxyvitamin-D3 <30 ng/mL (n=112) found oral supplementation with 16 000 IU of calcifediol per week improved asthma control test (ACT) scores (+3.09 vs −0.57 control; difference of 3.66 [95% CI 0.89 to 5.43]; p<0.001).

Thorax