Dr. Roger Seheult reviews how vitamin D works, and the benefits of vitamin D, both for respiratory infections in general and as it pertains to COVID-19.
Importantly, vitamin D is a steroid hormone that can pass through cellular membranes into the nucleus and controls the expression of genes. So, it's not just a mere vitamin required as a cofactor. It can actually modify how the cells in your body behave and function.
Vitamin D receptors are found in a large number of different tissues and cells, including your immune cells. This means vitamin D plays an important role in your immune function specifically.
A rather technical article at Mercola.com:
"Currently, the respiratory infection of note is of course COVID-19, and vitamin D appears to have a lot to do with your risk of this infection as well. According to a Spanish study (13,14,15) published online October 27, 2020, in The Journal of Clinical Endocrinology & Metabolism, 82.2% of COVID-19 patients tested were found to be deficient in vitamin D."
"As the weather cools, vitamin D levels will be dropping—note that “flu season” happens when vitamin D levels are depleted after winter sun deprivation. Adults may need 4,000 to 5,000 IU of vitamin D3 supplements daily."
An article by the Association of American Physicians and Surgeons discusses a report, published in the American Journal of Clinical Pathology, which notes that studies involving hundreds to thousands of individuals in the U.S. and Israel showed an association between prior vitamin D deficiency and the possibility of a positive PCR test.
More than 90 percent of nursing home patients are reportedly vitamin D deficient. This might help explain why they account for around half of COVID deaths though they represent less than 1 percent of the population. Does supplementation help? In a French nursing home, COVID survival in patients who had recently received an oral bolus of 80,000 IU of vitamin D3 was 82 percent, compared with 44 percent in those who had not...
Studies involving tens to hundreds of patients in Iran, Germany, Israel, Spain, China, and the UK reported correlations between low vitamin D levels and intensive care unit (ICU) admission, ventilator dependency, and death.
Vitamin D3 is preferably taken in oil in capsules for better absorption. Recommended doses are 5,000 IU or more, for 5 - 30 days, according to the Association of American Physicians and Surgeons.
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