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Vitamin D study #59 of 71
1/21 Analysis of outcomes based on serum levels
Walrand, S., Nature, doi:10.1038/s41598-021-81419-w (Peer Reviewed)
Autumn COVID-19 surge dates in Europe correlated to latitudes, not to temperature-humidity, pointing to vitamin D as contributing factor
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Analysis of the increase in COVID-19 cases in European countries, showing no correlation with temperature, but a significant correlation with country latitude. Since UV radiation decreases earlier for higher latitudes, this supports the theory that low vitamin D levels increases COVID-19 risk.
Author recommends that vitamin D supplementation be considered to reduce pandemic severity during the winter, noting that UV levels in Europe and Northern USA will not return to a level above that of October until the end of March.

Walrand et al., 1/21/2021, peer-reviewed, 1 author.
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