Wendie Trubow, MD, MBA, IFMCPPresident at Five Journeys, Functional Medicine & Wellness Provider, Best Selling Author, Passionate Champion for Health

The Hidden Job of Vitamin D in Your Immune System @DrSamShay

24 Aug 2026 · 1 min

Watch on YouTube

0:35

In this brief educational segment, the speaker outlines a cascade of biological processes that intersect with vitamin D activity. Starting with mitochondrial free‑radical damage and inflammation, the discussion moves to liver detoxification pathways, highlighting key Phase I and Phase II genes. The core argument is that vitamin D’s most critical function is mediated through its receptors, which determine the body’s ability to use vitamin D—not merely its synthesis. While vitamin D does support bone density, the speaker emphasizes that its primary, and often under‑appreciated, role is to regulate inflammation within the immune system, positioning this function at the top of vitamin D’s “resume.”

Chapters

So we've got inflammation, free radical damage, scavenging in the mitochondria. Then we have liver detox after that. So then we're looking at key genes in phase 1, key genes in phase 2. Then after that, we have vitamin D receptors, and these are your ability to use vitamin D, not merely synthesize vitamin D. And vitamin D is yes, it does bone density. Hooray! That's kind of on the bottom half of. Bottom 10th of its resume. The most important thing that vitamin D does is control inflammation in your immune system.