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PMID 25824066
However if your B12 is already borderline that could be enough reason for you to avoid it
While very high oral doses (1,000 to 2,000 mcg) can achieve some passive absorption without intrinsic factor roughly 1% of the dose is absorbed passively many clinicians prefer the reliability and rapid correction offered by injections in this population
Promotes Longevity: Reduces oxidative stress and inflammation, contributing to healthier aging at the cellular level
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