Important view here especially for COVID-19 response. This video lecture is a review of medical literature on Vit D3 efficacy in respiratory infections.

https://youtu.be/fmDng_uMCnY
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About budbromley
Bud is a retired life sciences executive. Bud's entrepreneurial leadership exceeded three decades. He was the senior business development, marketing and sales executive at four public corporations, each company a supplier of analytical and life sciences instrumentation, software, consumables and service. Prior to those positions, his 19 year career in Hewlett-Packard Company's Analytical Products Group included worldwide sales and marketing responsibility for Bioscience Products, Global Accounts and the International Olympic Committee, as well as international management assignments based in Japan and Latin America. Bud has visited and worked in more than 65 countries and lived and worked in 3 countries.
“Could Vitamin D Help with COVID-19?” Drbeen Medical Lectures. Streamed live on Apr 6, 2020. https://youtu.be/wJyT1YSwe-8
I found one critical review of the meta study discussed at the end of this lecture, which is concluded in the slide above. https://www.bmj.com/content/356/bmj.i6583/rr-0
Here is the link to the original meta study. Free sign up. https://www.bmj.com/content/356/bmj.i6583https://www.bmj.com/content/356/bmj.i6583