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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 Can You Take Too Much Vitamin B12? Overdose and Side Effects DripGym How Quickly Does B12 Shot Work? Does It Help to Lose Weight? Are Vitamin B12 Shots Right for You?
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