Does Feosol Cause Dark Stool?

Feosol^® Original contains a form of iron called ferrous sulfate which may produce side effects such as constipation, diarrhea, stomach cramps or upset stomach. One more iron side effect is dark or black stool.

Why does your stool turn black when taking iron?

You may have noticed after taking iron that your stools have turned black or dark green. While your first reaction might be, “Yikes! Something might be wrong,” don't be alarmed. Black or dark stools are a common side effect that may be the harmless result of unabsorbed iron.

Does black poop mean iron tablets are working?

Taking iron tablets will turn the stool a dark, almost black color (actually dark green). This is normal, and does not mean that the iron tablets are causing intestinal bleeding. Children are at particular risk of iron poisoning (overdose), making it very important to store iron tablets out of the reach of children.