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Can Vitamin B12 Cause Diarrhea or Make You Poop More? Performance Lab 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 B12 overdose: Signs, causes, and how to manage it do b12 injections cause constipation B12 Shots: Vitamin B12 Injections Benefits, Uses, Risks Are Vitamin B12 Shots Right for You?
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