Interesting paper recently from Israel. There has been controversy regarding Vitamin D levels and Covid severity. Many studies have found very low levels in the sickest patients, but critics have claimed the disease depletes your Vitamin D levels. In this study, researchers looked at Covid severity and mortality in patients where they had a Vitamin D level from before they caught the virus. So there is no possibility the disease causes the low Vitamin D level.

They found a very strong correlation between pre-existing Vitamin D levels and disease severity, with a huge relative risk ratio, and probability of error below 0.001. No drug company wants to fund a Vitamin D study, since it is dirt-cheap and not patentable. The take-away from this study is you would be a fool not to keep your Vitamin D level over 40 ng/ml. Cost is pennies a day, and for all the naysayers claiming they get all the Vitamin D they need from sunlight, these researchers pointed out the majority of people in sunny Israel are deficient! And Arab Israelis (with darker skin) are the worst since they make it from sunlight slower than lighter-skinned folks.

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The paper itself: https://journals.plos.org/plosone/article?id=10.1371%2Fjournal.pone.0263069

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