In general, zinc supplementation in children will not cause dark stools. For children in the growth and development period, zinc is a very important nutrient, although many foods contain zinc, but the effect of food is very small, you can follow the doctor’s instructions to take zinc drugs, such as zinc gluconate, lysine gluconate zinc granules, etc., to the child zinc supplementation will not affect the texture of the stools, the color and the number of times, and therefore the child supplementation of zinc will not make the stools black. If your child has black stools, he or she may have eaten a lot of iron-containing foods and medicines, such as pig’s liver, pig’s blood, iron, etc., or eaten pigment-containing foods that can cause black stools, such as black sesame seeds, etc. In addition, gastrointestinal bleeding, blood disorders and other diseases may cause black stools. In addition, gastrointestinal bleeding and blood diseases may also cause such conditions. It is recommended that children with dark stools should seek medical examination in time to clarify the cause of the disease and then carry out targeted treatment, so as to avoid adverse consequences.