Ferrous fumarate is a kind of iron compound corresponding to fumarate, and its appearance is red orange powder. Iron is one of the essential trace elements in animal body. It is a component of heme, myoglobin and cytochrome, which is closely related to the process of animal hematopoiesis, oxygen carrying and productivity. Ferrous fumarate, also known as fumarate, is a safe and efficient organic nutritional iron supplement, belonging to organic acid iron (including lysine iron, glycine iron, methionine iron, etc.). The content of iron in pure ferrous fumarate is 32.87%, so a 300mg ferrous fumarate tablet contains 105mg of iron. Moreover, after ferrous fumarate is absorbed, the divalent iron ions are easy to decompose, enter the red blood cells without additional energy, do not stimulate the stomach, can improve and maintain the normal level of heme, can be used as a nutritional additive for a long time, clinically used for the treatment of iron deficiency anemia.