An Israeli study of 253 people found those with vitamin D deficiency were 14 times more likely to develop severe or critical COVID-19 than those with sufficient levels. The researchers used blood samples taken before the pandemic to avoid the vitamin D drop that happens during illness.
A really great study that came out about vitamin D levels and the severity of COVID So this is an Israeli study. We know that vitamin D levels go down when you're sick. So if we just check people during COVID we're probably gonna find that they have low vitamin D. But this was, who did we have vitamin D levels on prior? And so when they looked at that, they found about 253 of them where they had a pre-COVID vitamin D blood draw. The bottom line was that if it— the vitamin D was deficient, so it was below 20 nanograms per milliliter, they were 14 times more likely to have severe or critical disease than patients who were over 40 nanograms per milliliter.
