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 If you notice your poop
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 Black stool after treatment : r HPylori Signs You May Have a B12 Deficiency Foods Causing Black Stool
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