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[DOI] [PubMed] [Google Scholar] Shahid M.B., Cetera B
Optimal B12 Levels Chart We like the B12 range from Sally Pacholok and Jeffrey Stuarts book, Could It Be B12

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Pract Neurol
Here are some of the groups who may be more at risk for a B12 deficiency (NIH, 2020): Those with atrophic gastritis: Between 10 and 30% of older adults are afflicted with atrophic gastritis, which results in decreased absorption of foods containing B12
