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 What Do Different Stool Colors
What Do Different Stool Colors Mean? Foods Causing Black Stool Why iron supplements turn stool black and what it means Understanding B12 Deficiency: Signs on Hands and Feet Signs You May Have a B12 Deficiency
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