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What Does a B12 Shot Do for You? Vitamin B12 Deficiency do b12 injections cause constipation B12 Shots: Vitamin B12 Injections Benefits, Uses, Risks B12 overdose: Signs, causes, and how to manage it 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
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