Dr. Martin often talks about why we need vitamin D, but he’s never really focused on the specific reasons why someone would be low in vitamin D.

It is estimated that 80 to 90% of the population have very low levels of vitamin D. Dr. Martin says it’s an international health crisis because the majority of people don’t know they’re deficient!

Join Dr. Martin in today’s episode as he goes over reasons why people are low in vitamin D!