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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 Signs You May Have a B12 Deficiency 3 Rare But Serious Side Effects of Vitamin B12 Supplements Does Vitamin B12 Cause Gas Symptoms? B12 overdose: Signs, causes, and how to manage it
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