

Are You Taking Too Many Vitamins? The Critical Nutrients You Need and the Ones You Don’t Need As Much Of with Chris Kresser
Oct 6, 2025
Chris Kresser, a leading functional medicine clinician and author, dives into the complexities of nutrient supplementation. He emphasizes that more isn’t always better, particularly with vitamins like D and K2. Kresser explains the risks of over-supplementation and highlights the importance of getting nutrients from whole foods, especially nutrient-rich organ meats. He also shares practical tips on how to incorporate these foods into your diet and discusses common nutrient deficiencies and the impact of bioavailability on absorption.
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Safe Vitamin D Testing And Dosing
- Test vitamin D and avoid long-term very high doses unless supervised.
- Start with 2,000–4,000 IU/day and adjust by testing, using 40–60 ng/mL as a target range.
Vitamin D Should Be Personalized
- Individual vitamin D needs vary widely by genetics, skin, body composition, and location.
- A personal vitamin D range is better than a one-size-fits-all target and 40–60 ng/mL fits most people.
Pair Vitamin D With Cofactors
- Always pair vitamin D with cofactors like K2, magnesium, and vitamin A when supplementing.
- These nutrients guide calcium to bones and reduce the risk of soft-tissue calcification and toxicity.