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For the c. 80% of the population who aren't Vitamin D deficient, yes, it is absolutely irrelevant. For the remainder, no, Vitamin D supplements might help. But as @Chalfie correctly notes, that doesn't make it a panacea which makes all problems go away.
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I don't think anybody would think it was a panacea, but tbh living with this existential threat is something that might be helped by taking a vitamin that I woukd suspect more than 20% of people in this country are deficient in. Particularly following our dark winters. Doing something that might support a stronger immune system is worthwhile imo, and handwashing, and behaving in such a way that assumes you are infectious. The fluffy wooly guidance by the government is in sharp contrast to the 'get brexit done' message of the election. Which can only heighten anxiety
are you saying vitamin d is irrelevant?