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Re:Study of the effect of Vitamin D, Magnesium and Vitamin B... by Traubenfuchs on Tuesday June 02, 2020 @09:37AM (#23390838)
There is a link in the second paragraph. https://www.emaxhealth.com/13955/vitamin-d-deficiency-and-ge...

I am not writing a peer reviewed article. Just wanted to throw out some numbers to engage with the thought of widespread deficiencies. If you want more reliable information there is lots of material available online.

Re:Study of the effect of Vitamin D, Magnesium and Vitamin B... by scott_s on Tuesday June 02, 2020 @12:08PM (#23392595)
> There is a link in the second paragraph. https://www.emaxhealth.com/13955/vitamin-d-deficiency-and-ge....

Those links are to studies which do not support the 40% claim. They are basic science research about vitamin interactions in the human body. Please consider that if you can't find studies showing "widespread deficiencies," then perhaps they don't exist.