The so-called popularity of vitamin D has reached a level such that even people and doctors who do not generally believe in vitamins or supplements have started to jump on the bandwagon of keeping vitamin D levels hearty.

There is a link between vitamin D and depression. That seems clear. What that link looks like, though, is still somewhat uncertain. This raises three important issues.

No question, doctors and patients are now joining the vitamin D revolution in large numbers. More and more doctors are ordering tests to determine vitamin D blood levels and more patients are reading about the positive benefits of vitamin D in news reports.