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For vitamin B12 to be absorbed from the gut, it must bind to a protein called intrinsic factor, which limits how much B12 the gut can take in at one time
Gastrointestinal symptoms: alteration in bowel motility, such as mild diarrhea or constipation, and loss of bladder or bowel control
Reference: Neelakantan H, Vance V, Wetzel MD, Wang HY, McHardy SF, Finnerty CC, Hommel JD, Watowich SJ (2018)
Research use only
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