However, they most assuredly can negatively affect Vitamin D production in some people, to the point of extreme fatigue, arthritic-like joint pains severe enoug

However, they most assuredly can negatively affect Vitamin D production in some people, to the point of extreme fatigue, arthritic-like joint pains severe enough to prevent walking etc. I spent a year with such pains visiting specialists with no diagnosis till I mentioned it to my heart doctor on a routine visit, who seemed to be the only one to do a blood test for Vitamin D levels, and viola, a pill a week cleaned it (mostly) up.