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A member asked:
Other than constip/gi bleed/bismuth, can anything else cause very dark to black stool? i'm having 2-5+ bm daily, but stool is usually very dark. if it's lighter, it has 2-3mm black outer layer.
A doctor has provided 1 answer
See below: The bismuth that you are taking as well a GI are the main causes in your circumstance as well as taking iron tablets.
Answered 6/10/2014
4.9k views
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