One of the most common health problems in America is also one of the most overlooked: vitamin D deficiency.

Vitamin D deficiency affects everything from our mental health to our immune system, yet it often goes untested. Why?

In the clip below, Erica Armstrong, MD, IFMCP explains why: the test can be expensive and isn't always covered by insurance. That simple barrier prevents doctors from checking a foundational piece of our health.

Hear the full conversation on functional medicine on this week's episode of Self-Funded with Spencer, available now on YouTube, Spotify, and Apple Podcasts.