I have notice that in the last period some times when I go to the toilet my stool is black and I am worried about it. In the last week I start a treatment with iron supplement because my
ferritin levels are very low. Apart from that I have been taking the medicine Glucophage for over 4 months but I didnt jave any problem before. The problem with the stool is in the last weeks and I think before starting the medication for iron, but I'm not 100% sure. Thank you for your time.