A while ago earlier claims that Vit D could help with Asthma were disputed by subsequent Research. Now there's fresh evidence from a solid source that Vit D could significantly contribute to reduced Steroid Dependency and could half emergency hospital visits.
UK Press (including the Mail, Sun and Telegraph) have covered the Story this week (Oct 2017).
Apparently, at present, the news is most relevant to mild to moderate Suffers as Severe Suffers were under-represented in the Research. Howver, that doesn't necessarily mean that Severe Sufferers won't also benefit, just that their were too few Severe Suffers in the group covered by the Research.
I for one will be grabbing some more rays and popping Vit D pills once every day or two this winter when there's less sunshine about.