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Can Vitamin B12 Deficiency Be a Sign of Cancer? 2026 Update Care Sync Experts Blog Care Sync Experts How Quickly Does B12 Shot Work? Does It Help to Lose Weight? 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 Vitamin B12 Cause Diarrhea or Make You Poop More? Performance Lab Benefits of Vitamin B12 Shots Complete Health Partners 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
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