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 5 Causes of Black Poop
5 Causes of Black Poop and When To See a Doctor Understanding B12 Deficiency: Signs on Hands and Feet Black Stool Sign: 7 Serious Health Conditions That Can Cause Black Coloured Poop Vitamin B12 deficiency: Complications may include pancytopenia and black tarry stool
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