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Vitamin B12 Side Effects 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 Vitamin B12 Absorption Post Gastrectomy Human STEAM Vitamin B12 Deficiency: Causes, Symptoms, and Treatment Are Vitamin B12 Shots Right for You?
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