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@JWestland
There are so many factors, unless you are clearly low in vitamin D (only way to find out is a blood test) it may do nothing anyway, and it won't resolve all the risk factors Chalfie mentions either.
I took vit D for a while and it did exactly nothing against the office winter bugs. Did I have low blood levels? No idea, I was didn't feel like bugging my GP with a blood test.
A colleague of mine has weak bones, so she has to take it for bone mineralization but that is one thing we are sure it works. Due to all the risk factors interpreting research is hard too, they would really need to do a trial with BAME people, test blood levels and then if they are low do a trial with vitamin D, but right now it is speculation.
Vit D won't fix my partner's asthma either :)