Ferric ammonium citrate is a complex compound of iron, nitrogen, carbon, and oxygen that is commonly used in the food industry as a food additive. This compound is sometimes referred to by other names, including iron ammonium citrate, ammonioferric citrate, or citrate of iron and ammonia. In addition to its use in the food industry, ferric ammonium citrate is also used in the pharmaceutical industry to treat iron deficiency anemia and as a nutritional supplement. Other synonyms for ferric ammonium citrate include ammonium iron(III) citrate, iron ammonium citrate complex, and ammonium ferric citrate tetrahydrate. Regardless of the name it goes by, this compound plays a crucial role in our food and health industries.