Cinnamomum bark is used orally in formulas as a warming herb for conditions due to Interior Cold. It is also used in order to assist the action of other tonic herbs, to promote the circulation of the Qi and the Blood, alleviate pain due to Cold and also to send deficiency Fire (from Kidney Yang deficiency) back down to its source in the Kidney. It has been shown to have the following actions: antispasmodic, analgesic, antipyretic, sedative, digestive stimulant and carminative.