RHR: Vitamin D: Why a Personalized Approach Is Best

In this episode of Revolution Health Radio, Chris Kresser explains why vitamin D supplementation should never be one-size-fits-all. Drawing on new research—including a groundbreaking study on magnesium's regulatory role—Chris explores how genetics, ethnicity, body weight, age, health status, sun exposure, and nutrient cofactors all shape an individual's vitamin D needs. He outlines optimal testing strategies, safe and effective target ranges, and the critical roles of magnesium, vitamin K2, and vitamin A in vitamin D metabolism. The episode reframes vitamin D optimization as a personalized, systems-based approach that prioritizes balance, testing, and real-world physiology over generic dosing guidelines. In this episode we discuss: Why standard vitamin D recommendations don't work for most people The impact of obesity, aging, gut health, liver function, and kidney health Optimal vitamin D blood levels—and why more is not always better The U-shaped risk curve of vitamin D deficiency and excess Why testing and seasonal retesting are essential Magnesium's newly discovered role as a "vitamin D thermostat" Sun exposure benefits beyond vitamin D production How to personalize supplementation based on labs and lifestyle Show notes: Links to all of the studies mentioned in this podcast can be found here Learn more about Adapt Naturals Bio-Avail D3K2, Core Plus bundle, or take our quiz to see which products best suit your needs If you'd like to ask a question for Chris to answer in a future episode, submit it here Follow Chris on Instagram or Facebook Add back in what the modern world has crowded out and feel and perform your best with Adapt Naturals supplements. Learn more and place your order at AdaptNaturals.com. If you appreciate the show and want to help create a healthier and happier world, consider leaving a review!