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I'm pleased to see some have signed up. I think it's an important study that needs to be done...and not just for vitamin D's role in reducing the effects of covid. As most people in the UK are low on vitamin D this sends out a message about how important it is for general health.
Oh...and if you're going to get your D via the sun, you've got to do it without sunscreen. Only 15-30 minutes needed in strong sun if I'm not mistaken.
I've been taking it for years, though I'd like a test to see what my levels are now.