Patients with evidence of vitamin B 12 deficiency and chronic gastrointestinal symptoms such as dyspepsia, recurrent peptic ulcer disease, or diarrhea may warrant evaluation for such entities as Whipple's disease (a rare bacterial infection that impairs absorption), Zollinger-Ellison syndrome (gastrinoma causing peptic ulcer and diarrhea), or Crohn's disease
Scientific References Frequently Asked Questions Can you have too much vitamin B12
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B12's role in melatonin synthesis and neurotransmitter production supports the sleep quality that makes appetite regulation possible
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