Iron supplements during pregnancy are generally recommended to be taken half an hour before a meal and with vitamin C to help iron absorption. Some pregnant women may feel stomach upset and irritation after taking iron supplements, which can be changed to take after meals. Although iron absorption will be better when taken on an empty stomach, if the stimulation of the gastrointestinal tract is greater after taking iron, it can be changed to half an hour after meals, but you need to avoid taking it together with milk, etc., so as not to affect the absorption of iron. By adjusting the time of taking iron, most of the gastrointestinal reactions can be effectively relieved.