[mlyle]

I think a responsible way to look at vitamin D right now is:

- There was an association shown between low serum levels and bad COVID-19 outcomes, but low vitamin D is an indicator of frailty, so it was how much of this relation was causal.

- Now we have some early data that sure makes it look causal and it seems to be a significant effect, but it's not watertight yet.

- We know that a big fraction of us have low vitamin D levels with other health consequences from it.

- Taking a moderate dose of vitamin D now seems like a reasonable hedge: low risk of health consequences, and a decent chance of health benefits even if it doesn't protect us from the pandemic.