300: Why do my urinary B6 markers say I'm deficient if I'm supplementing and my plasma levels are high-normal?
Masterjohn Q&A Files Episode 300
Short answer: Low or low-normal alkaline phosphatase may raise the plasma B6 level over the cellular level. Tryptophan metabolites in urine reflect the B6 requirement for the kynurenine pathway, and this requirement increases with more estrogen, more inflammation, or a higher protein intake.
This episode was cut from the original Q&A session that you can find here.
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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