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Revolution Health Radio

RHR: Vitamin D: Why a Personalized Approach Is Best

Revolution Health Radio

Chris Kresser

Health & Fitness, Alternative Health

4.7 • 1.7K Ratings

🗓️ 10 February 2026

⏱️ 29 minutes

🧾️ Download transcript

Summary

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.

The post RHR: Vitamin D: Why a Personalized Approach Is Best appeared first on Chris Kresser.

Transcript

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0:00.0

Chronic stress and poor sleep are at the root of so many health issues.

0:14.0

But between work deadlines, family responsibilities, and everything else life throws at us,

0:18.9

finding calm can feel impossible.

0:22.4

That's why I formulated steady spirit, a comprehensive stress and mood support supplement from my Adapt Naturals line. It features

0:29.0

clinically backed doses of five powerhouse ingredients like Afron-Safron, Sensero Aschaganda,

0:35.8

Rilissa Lemonbaum, Elthianine, and Holy Basel to help you manage everyday stress,

0:41.0

promote a sense of calm, achieve focus clarity during the day, and support better sleep at night.

0:47.3

Just two capsules a day deliver real results. Reduce stress, a calmer mind, improve mood,

0:53.0

better focus without jitters, and more restful sleep,

0:56.4

with noticeable benefits in as little as two weeks. Visit adapt naturals.com to learn more about

1:02.3

steady spirit and take the first step toward going from wired and tired to calm and clear,

1:07.2

naturally from the inside out.

1:10.1

Hey everybody, Chris Cressor here. Welcome to another episode of Revolution Health Radio.

1:13.6

Researchers at Vanderbilt just published a fascinating study that could change how we think about vitamin D supplementation.

1:20.6

They found that magnesium doesn't just raise vitamin D levels across the board.

1:25.6

It acts like a thermostat, raising vitamin D levels in

1:29.1

people who are deficient while lowering them in those whose levels are already high. This is the

1:34.8

first clinical evidence suggesting that magnesium helps optimize vitamin D levels rather than simply

1:40.8

increasing them. This finding is significant because vitamin D supplementation

1:45.2

has become increasingly common.

1:47.4

Millions of people are taking vitamin D supplements,

1:50.0

often in doses of 2,000, 5,000 or even 10,000 IU per day.

...

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