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You are over the age of 50 (when stomach acid naturally declines)
However, if the underlying cause of your deficiency remains such as pernicious anemia or ongoing medication use that impairs absorption your B12 levels will gradually decline after discontinuation
(PubMed) Ottobelli L, Manni GL, Centofanti M, Iester M, Allevena F, Rossetti L
These observations help researchers form hypotheses about potential mechanisms of action, but they do not establish clinical relevance or real world outcomes
Hybrid formulations capture both [8]
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