> There is a link in the second paragraph. https://www.emaxhealth.com/13955/vitamin-d-deficiency-and-ge.. https://www.emaxhealth.com/13955/vitamin-d-deficiency-

> There is a link in the second paragraph. https://www.emaxhealth.com/13955/vitamin-d-deficiency-and-ge.. 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.