Iron supplements are mostly recommended to be taken 30-60 minutes after meals, in addition to 7-8 pm. Iron itself has an odor and has a certain stimulating effect on the gastrointestinal tract. Some sensitive patients may experience nausea, vomiting, diarrhea, abdominal pain, and even dizziness and weakness after taking it. As the stomach acid secretion is most active 30-60 minutes after meals, taking it at this time not only helps iron absorption, but also prolongs the residence time of iron in the duodenum and reduces the irritation of iron to the gastric mucosa. In addition, taking iron orally while taking vitamin C can promote iron absorption, so it is recommended to eat tomatoes, oranges, kiwi, etc. At the same time, you should avoid drinking strong tea, coffee, carbonated beverages, etc., during taking iron supplements, so as not to affect iron absorption. In addition, research shows that iron absorption also has a clear diurnal pattern, most people take iron at 7-8 pm, compared to the morning absorption rate increased by 1 times. In general, the process of iron supplementation needs to be continued for 2-3 months after the hemoglobin is normal in order to restore the body’s iron storage level.