A member asked:

What causes blue poop?

A doctor has provided 1 answer

Blue poop: Blue food coloring is a popular food additive, and when ingested in large quantities can make stools appear blue. Blue is not a pigment typically produced by the human GI tract. Blue is however the color that a hemoccult card will turn if blood is detected in stool--is this to what you are referring?

Answered 4/15/2020

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