The reason why the stool becomes black when taking iron supplements is because iron will combine with hydrogen sulfide in the gastrointestinal tract, causing the stool to become black due to iron sulfide. If you stop taking iron supplements, your stool will turn to normal color. If there are no combined gastrointestinal symptoms, such as abdominal pain, acid reflux, heartburn, no vomiting of coffee-colored liquid, and no intestinal bleeding, there is no need for special treatment. Since iron is mainly used for the prevention and treatment of iron deficiency anemia, it is recommended to take it during or after meals to reduce the irritation to the stomach. Various iron supplements should not be taken together with strong tea to prevent the effect of the treatment. It should be noted that the daily iron supplementation should be used in preventive doses and not in therapeutic doses for too long. A doctor’s guidance should be provided to help choose a reasonable type of medication and to help assess the efficacy and safety of iron supplements after use.