Same with the COVID is airborne studies.
WHO: NOT ENOUGH EVIDENCE 
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Would it make more sense to look for vit D deficiency in those who have severe cases or die from COVID and compare that to a control? I wonder if the focus on supplementing is a problem. Where I live, I can't make vit D for several months so I supplement then but not year round.
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Nah, the best strategy for the good of science is to not study vitamin D at all. For the good of a career, though, studying vitamin D is the gift that keeps on giving.
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The study is more than imperfect; it is too flawed to allow interpretation. Previous retro studies confused correlation & causation: the correlates of hypovitaminosis D are known; those conditions & factors are associated/implicated in excess Covid morbidity & mortality.
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GidMK: my message was lost in the 20+ page tweet of valid critique of experimental design D-stans: the effect of treatment is HUGE and CONTROLS for baseline-D that varied between individual/hospital Everyone: Why can't they show results?
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Counterpoibt: pretty good demonstration of why "the best weve got" is not relevant to the value of the evidence, since it sets low and easily abused standarda.
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I think a large trial of CVD prevention using vitamin D is a higher form of evidence.
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