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For individuals with healthy absorption who need modest B12 supplementation, oral forms may adequately maintain levels at minimal expense
doi:10.1002/14651858.CD004655.pub3
Borrows (not his real name) also made a poor first impression when he insisted that people with B12 deficiency can easily be treated with oral supplementation, as 1% of an oral dose is taken up in the body by a process called passive absorption
The changes are significant enough that other people start commenting
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