Tag: Black poop

According to anecdotal evidence and medical forums, a significant number of people report a change in stool color after starting supplements. While pure vitamin B12 is unlikely to cause black stools, formulations containing iron are a common reason for the change, leading many to ask: can B12 supplements cause black poop?

A staggering 1.2 billion people worldwide suffer from iron deficiency anemia, and for many, treatment with supplements can bring an alarming side effect: black or dark-colored stool. However, while iron supplements can directly cause black poop, *can iron deficiency cause black poop* itself? This question requires a deeper look into both nutrition and gastrointestinal health.