Vitamin D does not reduce colds in asthma patients

Vitamin D supplements do not reduce the number or severity of colds in asthma patients, according to a new study. The findings surprised the researchers who had previously published research showing a 40 percent reduction in asthma exacerbations in patients with a vitamin D deficiency who achieved normal levels of the vitamin with supplements. Because colds often trigger exacerbations, they hypothesized that vitamin D supplementation would reduce colds and cold severity.