Ammoniacum, also known as ammoniac, is a natural gum resin that is harvested from the sap of specific species of plants, particularly those in the genus *Ferula*, which belong to the umbellifer family. The most commonly used species for this purpose is *Ferula assa-foetida*, also known as asafetida or devil's dung. Ammoniacum is typically found in regions like Persia and Afghanistan.
