On reading this, all I could say was OMG!
health.harvard.edu/blog/vit...
"In this piece, several of the leading epidemiologists and endocrinologists who were on the original IOM committee argue for a lowering of the currently accepted cutoff level of 20, stating that the level they estimated as acceptable was never intended to be used to define vitamin D deficiency. They feel that we are over-screening for vitamin D deficiency, and unnecessarily treating individuals who are perfectly fine.
Based on their analysis, a more appropriate cutoff for vitamin D deficiency would be much lower, 12.5 ng/mL. They examined a massive amount of data from the National Health and Nutrition Examination Survey (NHANES) for 2007 through 2010, and found that less than 6% of Americans had vitamin D levels less than 12.5. A cutoff of 12.5 ng/mL would most certainly eliminate the “pandemic” of vitamin D deficiency."
All they had to do was go with the numbers. Just ignore how healthy those people are (according to their doctors) -- or worse yet, how well they feel.