Q&A: Can More Vitamin D Protect You From Colds When You Have Asthma?
If you have asthma, vitamin D supplements won’t protect you against colds, new research suggests.
The study found that taking vitamin D supplements didn’t reduce the number or severity of colds in adults with mild-to-moderate asthma.
More than 400 participants, all of whom had low vitamin D levels, took either vitamin D supplements or a placebo for 28 weeks. During that time, about half of them got at least one cold. Eighty-two percent of those in the supplement group had sufficient levels of vitamin D after 12 weeks, but that didn’t boost their resistance to colds, the research revealed.