Is iron black absorbed or not absorbed?

After iron supplementation, it is not possible to judge whether iron has been absorbed just by the black color of the stool.

After iron supplementation, iron will combine with hydrogen sulfide in the gastrointestinal tract to form black iron sulfide, which will cause the stool to turn black. Whether iron is absorbed by the human body or not, such performance will occur, so it is not possible to directly determine whether iron has been absorbed based on this. If you want to know the absorption of iron, you can seek medical attention for serum iron, serum transferrin saturation and other related tests.

After iron supplementation, you should pay attention to observe your own performance. If abnormal symptoms occur, you need to seek medical attention promptly for a systematic examination.