Boston University’s Dr Michael Holick found in his previous research that people who have enough vitamin D are 54 percent less likely to catch coronavirus in the first place. Following on that work, he and his team have found that people who don’t get enough of the vitamin are far more likely to become severely ill, develop sepsis or even die after contracting coronavirus. Because vitamin D deficiency is common in people with other disease that raise coronavirus risks, it’s impossible to say exactly how many lives would be spared if we all got our daily dose of the sunshine vitamin. But we know that about 42 percent of the US population is vitamin D deficient. If that rate held true for the more 203,000 Americans who died of coronavirus, perhaps some 85,000 would have fared better with improved vitamin D levels.
https://www.theautomaticearth.com/2020/09/vitamin-d/
Dr Holick and his colleagues took blood samples from 235 patients admitted to hospitals in Tehran for COVID-19. Overall, 67 percent of the patients had vitamin D levels below 30 ng/mL. There isn't a clear marker for the ideal level of vitamin D, but 30 ng/mL is considered a sufficient. Anything below that is 'insufficient,' but won't necessarily have broad-ranging health consequences, while levels below 20 ng/mL are considered 'deficient.' In the US, an estimated 42 percent of people are vitamin D deficient, but the rate varies considerably in different demographics.
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