Cassia is a shrub with green foliage year-round and is native to southern China, where it is cultivated yet also grows wild. In order to extract this essential oil with a very high quality, the fresh leaves and branches of the shrub are steam distilled, ideally in autumn or during midsummer. Chinese herbalists use cassia as they do Ceylon cinnamon. This essential oil is an important ingredient of red tiger balm. It is known to be effective against all germs, bacteria and mycoses. Furthermore, essential cassia oil is used because it stimulates blood circulation. It can also be used to relieve pain.