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Pernicious Anaemia: When Your Body Can't Absorb Vitamin B12 Properly Constipation in B12 deficiency is primarily neurogenic, due to autonomic and enteric neuropathy causing slow gut motility Constipation may precede anemia Often improves after B12 replacement Think of B12 Low Vitamin B12? Diet vs. InjectionsWhat Works Faster? What are the Signs of B12 Deficiency
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