going back to 2006, here's an NIH report entitled Vit D & African Americans.

https://ncbi.nlm.nih.gov/pubmed/16549493 
Vit D needs sunlight to do its work in our bodies hence the issue in sr communities also. Many srs, especially those living in nursing homes, do not get outside on a daily basis nor do they exercise nearly enough, if at all. Many people don't consume dairy products such as milk.
Vit D actually isn't a vitamin at all either but I don't want to confuse anyone. This thread is aimed to be helpful & hopeful to at-risk individuals - as I am also one & also a #Covid19 survivor which I have attributed to a rigorous healthy lifestyle.

Diet & exercise, always!❤️
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