Short Answer: While it is unclear, it could relate to vitamin K depletion, hypercalcemia, or compensation in acid-base balance. First and foremost, use the full testing algorithm in Testing Nutritional Status: The Ultimate Cheat Sheet (available at https://chrismasterjohnphd.com/cheatsheet) rather than just testing 25(OH)D to determine deficiency.
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DISCLAIMER: I have a PhD in Nutritional Sciences and my expertise is in performing and evaluating nutritional research. I am not a medical doctor and nothing herein is medical advice.
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Chris Masterjohn, PhD, is the Founder and Scientific Director of the mitochondria test Mitome