Causal inference and strength of evidence (again, this is my wheelhouse) is extremely nuanced and complex. It may not "seem" weaker, but it is, in fact, extremely weak to the point of irrelevance. Gotta stop here, sorry.
It's not just the size, it's the sources of bias. As I've said (and I think Noah would agree), the evidence around Vit D for COVID-19 is currently far too weak to make any causal claims
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So I guess what I'm asking is why is the evidence for masks that strong? Or alternatively why do we need a bullet proof casual claim to take a supplement?
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I never said it was? And I never said you do? I do think people underplay the potential costs of the multibillion dollar supplement industry, but that being said my point is that there's no good evidence vit D has a benefit for COVID-19 - do you agree?
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