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Best Vitamin B12 Injection Site: Administering B12 Shots Can Vitamin B12 Deficiency Indicate Cancer? Know Warning Signs Medinaz Vitamin B12 Deficiency Vitamin B12 deficiency happens when the body does not have enough vitamin B12. Vitamin B12 is important for making healthy red blood cells and 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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