Ferric ammonium citrate + folic acid and vit. B 12 syrup is a combination of ferric ammonium citrate, folic acid and vitamin B 12. It is an iron supplement used to treat or prevent iron deficiency anemia. It works by helping the body produce red blood cells. Folic acid and vitamin B 12 helps to prevent certain types of anemia caused by a lack of these vitamins. It is used to treat and prevent iron deficiency anemia.