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Oral Supplementation Studies suggest that about 56% of an oral B12 supplement is absorbed, but this is largely dependent on the capacity of intrinsic factor (a glycoprotein released by the stomach that is needed for B12 absorption)
However, it is highest in your nervous system and brain
For decades, its physiological relevance remained speculative, as the peptide had not yet been identified in human tissue
Because infusions can be used for a number of different medicines, your doctor will inform you if there are any medications from which you should abstain before the procedure
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