What vitamin makes your poop black?: The Surprising Truth About Iron and Other Causes
                                
                                
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                                    3 min read                                
                            
                                According to the Cleveland Clinic, black stools can be caused by certain medicines, supplements, and foods. So, **what vitamin makes your poop black**? The surprising answer is that it's typically not a vitamin, but the mineral iron, often from dietary supplements, that is responsible.