can b12 injections cause black stools stool isn’t always harmless—it signal internal bleeding in the digestive tract. While some foods or iron supplements can darken stool, persistent black, tarry need urgent medical Vitamin B12 deficiency: Complications may

Vitamin B12 deficiency: Complications may include pancytopenia and black tarry stool If you notice your poop is black , it might be due to something as simple as a change in your diet or a new medicine you're taking. Sometimes, though, it's a Understanding B12 Deficiency: Signs on Hands and Feet What Do Different Stool Colors Mean? Why iron supplements turn stool black and what it means

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