On: Vitamin D deficiency and Covid-19 mortality [pdf]

[BurningFrog]

Thanks. I didn't know.

Amazon has a few options in the $50-90 range.

You prick your finger, draw a "small amount" of blood, and send it to a lab.

[secabeen → BurningFrog]

The order it yourself lab companies compete on the Vitamin D test, you can usually get one for $40.