The First Randomized Controlled Trial on Vitamin D and Covid-19

Re:The First Randomized Controlled Trial on Vitamin D and Co... by DenisM on Friday September 04, 2020 @10:54AM (#24375460)

Thanks for taking the time write it all out, much appreciated.

Do you know if the time of day makes a different? I avoid the Sun between 9am-3pm as that seems relatively easy to get sunburned during that time, but I wonder if the alleged benefits are tied to the same time window?

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Re:The First Randomized Controlled Trial on Vitamin D and Co... by lhl on Sunday September 06, 2020 @02:45AM (#24389493)

Yes, time of day actually matters greatly since it depends on UVB exposure. Here's some classic research from 1988 discussing the topic:

Webb, A. R., L. Kline, and M. F. Holick. “Influence of Season and Latitude on the Cutaneous Synthesis of Vitamin D3: Exposure to Winter Sunlight in Boston and Edmonton Will Not Promote Vitamin D3 Synthesis in Human Skin.” The Journal of Clinical Endocrinology and Metabolism 67, no. 2 (August 1988): 373–78. https://doi.org/10.1210/jcem-67-2-373.

Also, here's a web calculator that can help you calculate UV exposure required to get a desired amount of Vitamin D (and to avoid a sunburn) based on location, time of year and day: https://fastrt.nilu.no/VitD_quartMEDandMED_v2.html

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