Iron supplement medications should not be used with tea, milk or medications or foods containing metal ions, as they may affect the absorption of iron if used at the same time, and if you need to drink milk when using iron medications, the interval should be 2-3 hours. The use of iron supplements may cause irritation to the gastrointestinal tract, such as nausea, vomiting, abdominal pain, diarrhea and other symptoms, in order to reduce the occurrence of symptoms it is recommended that iron supplements be used 15-30 minutes after meals. It is also recommended to take vitamin C supplements to promote the absorption of iron, and the color of stool may be black during the use of iron supplementation, which needs attention.