Vitamin D isn’t actually a vitamin. Dr. Steven Gundry explains why he considers it one of the most important hormones in the human body — and why 80% of his new patients walk in dangerously deficient in it, even living in sunny Southern California.
In this episode, Dr. Gundry will answer the following questions:
– What does vitamin D actually do to your immune system that makes it so critical?
– What does vitamin D actually do to the trillions of bacteria living in your gut?
– Why do the stem cells lining your gut wall need vitamin D just to do their job?
– What vitamin D level range do the largest labs in the country consider normal — and how does that compare to what most physicians were taught?
– What happened when Dr. Gundry met two patients in their 70s with vitamin D levels around 270 — and what did they teach him that changed his entire approach?
– Why do people with the highest vitamin D levels tend to live the longest?
Dr. Gundry doesn’t just recommend vitamin D to his patients — he takes it himself every single day, and considers it one of the most important additions anyone can make to their daily routine. He pairs it with vitamin K2, since the two work together, which is exactly why Gundry MD’s vitamin D supplement includes both. If you’ve been putting off getting your levels checked, this episode may change your mind.
For years, the medical field has treated vitamin D almost like an afterthought — a box to check on routine bloodwork rather than a hormone that touches nearly every system in the body. But the deeper the research goes, the clearer it becomes that this single nutrient sits at the intersection of gut health, immune function, and how long we actually live. That’s a big claim, and in this episode Dr. Gundry walks through exactly why the science supports it.
00:00 – What If You Took Vitamin D for 30 Days?
00:51 – Why So Many People Are Deficient (Even in Sunny Places)
01:57 – Vitamin D and Your Gut Microbiome
03:06 – Vitamin D and the Stem Cells That Repair Your Gut Wall
04:48 – Vitamin D and Your Immune System
06:38 – Is Vitamin D Toxic? What the Research Actually Shows
10:15 – The Patients Who Changed Dr. Gundry’s Mind Forever
11:59 – Why the Longest-Living People Share This One Trait
If you’ve ever been told your vitamin D level was "normal" and moved on without a second thought, this episode might make you want to ask your doctor to look again. The definition of normal has shifted, and where your level actually falls could matter more than you realize.
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