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B12 overdose: Signs, causes, and how to manage it What Does a B12 Shot Do for You? Vitamin B12 Deficiency Who Needs Vitamin B12 Shots? Exploring Indications And Reasons For B12 Injections Vitamin B12 and ulcerative colitis: Links and more 3 Rare But Serious Side Effects of Vitamin B12 Supplements 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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