What are the links between vitamin D and COVID?

vitamin D COVID-19

Across the internet, I keep reading about some relationships between vitamin D levels and COVID-19. I’ve written about it twice (here and here), but I have never seen reliable, robust, and repeated clinical trial data that supports a link between vitamin D levels or deficiencies and COVID-19.

So, I thought I would take a look at it once again, and see if there’s anything there. I keep wondering if vitamin D is just another “miracle supplement” that, once you scratch the surface of data, you find that there is actually nothing there.

What we know or think we know about COVID-19 seems to change daily, partially because the disease caught us by surprise. But every day we seem to get new data that contradicts something we thought or adds to our knowledge of the disease. And sometimes both.

Let’s take a look at the current data on vitamin D and COVID-19.

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