The Science Behind Vitamin D, Our Rampant Deficiency, And Its Harmful Impact On Our Health

Episode 825 49m


In the US alone, 70% of Americans have either deficient or suboptimal levels of vitamin D. This is a massive problem given vitamin D's impact on our health and its effects on our gene regulation and expression. Vitamin D also regulates calcium and supports the functioning of the immune system, making it one of the most important biological compounds in the body. In today’s episode of a new series I’m calling Know Your Numbers, I dive deep into vitamin D. I discuss why vitamin D deficiency is a problem, how conventional medicine misses the mark in measuring vitamin D levels, how Functional Medicine treats vitamin D deficiency, and much more.

You can test your vitamin D levels with Function Health, a company I co-founded. It has been a lifelong dream for me. Function is the first-ever membership that includes 100+ lab tests and personalized insights from globally renowned doctors based on your results. Join Function at


This episode is brought to you by MitoPure, and AG1. The Doctor’s Farmacy podcast works with a select group of sponsors to allow for ongoing production and allow it to be zero-cost to anyone who wishes to listen to and watch the podcast.

Topics Covered

  • Why vitamin D deficiency is a problem


  • What is vitamin D and what does it do in the body?


  • “Normal” vs. optimal vitamin D references ranges


  • How much vitamin D should you take?


  • Root causes of low levels of vitamin D


  • Testing your vitamin D with the 25-hydroxy vitamin D3 test


  • Symptoms of and diseases associated with vitamin D deficiency


  • Addressing vitamin D deficiency with diet, lifestyle and supplementation


1 of 8

Host & Guests


Automatically generated. Please forgive any typos or errors in the following transcript. It was generated by a third party and has not been subsequently reviewed by our team.

Narrator: Coming up on this episode of the Doctor's Pharmacy, Dr. Mark Hyman: It's not part of your routine lab test and it needs to be everybody should get their vitamin D tested. Welcome to the Doctor's Pharmacy. I'm Dr. Mark Hyman and this is a place for conversations that matter and I want to welcome you to my new podcast series called Know Your Numbers designed to help you understand your health through the lens of your own biology and your lab tests. Looking particularly through the lens of functional medicine. Now for too long, healthcare is required you to go to your doctor to access your own blood tests and your biology and then rely on your doctor to guide you. We are now entering an era where..

Want to read the full transcript for free?

Enter your name and email to sign up for our newsletter and unlock the transcript

Back to Content Library
Ep. 825 - The Science Behind Vitamin D, Our Rampant Deficiency, And Its Harmful Impact On Our Health