Yeah I get that. But it’s suspicious that something is leading to that different an outcome. Is it truly their vitamin D level or is that just a marker of outdoor time meaning that person leads a more active life?
It just seems like a cheap easy step to take during winter months - maybe my levels were already normal and I’m wasting 5 cents a day. Maybe if I have low vitamin D level I do worse with covid because of other factors like I don’t go outside and exercise in the sun. But for 5 cents a day I’ll include it in my approach - amongst other things like vaccinations, masks, distancing, sleep, exercise etc
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