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A member asked:

I have been taking fish oil, magnesium,b12,and iron pills together will they cause by bowel movement to change like dark green or black looking?

3 doctors weighed in across 2 answers

It's the iron: It will turn your stools black or dark green.

Answered 6/30/2018

3.8k views

Thank

Iron pills will: it is probably the iron pills causing bark green/black stools.

Dr Goebel agreed

Answered 6/30/2018

3.8k views

Thank

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