Cinnamon can be taken as a decoction or as a powdered brew. Cinnamon is the dried bark of Cinnamomum cassia, family Camphoraceae. It is pungent, sweet, and hot in nature. It belongs to the kidney, spleen, heart and liver meridians. It has the effects of tonifying fire to help yang (replenishing yang qi in the body), inducing fire to return to the source (inhibiting the rising of fire evils in the kidneys), dispersing cold and relieving pain (relieving pain by removing cold evils in the body), and warming the meridians. Cinnamon can be used for impotence, cold uterus, cold pain in the waist and knees, asthma due to kidney deficiency, deficiency of yang (relative deficiency of yang affecting the head and face), dizziness, cold pain in the heart and abdomen (cold pain at the location of the heart, mouth, and abdomen), vomiting and diarrhea due to deficiency of cold, cold hernia (acute abdominal pain caused by deficiency of coldness in the internal organs and coldness of the external wind), and menstrual dysmenorrhea and menstrual closure. Cinnamon is beneficial to fire and yang, hot and pungent yin and blood, so yin deficiency fire (Yin essence loss in the body, the emergence of hyperactive fire) should not be served, bleeding tendency to be used with caution; pregnant women should be used with caution; and should not be used with the red stone resin. As a Chinese herbal medicine cinnamon is generally decoction, dosage of 1 ~ 5g, appropriate after the next or baked service, can also be powdered punch, dosage of 1 ~ 2g. patients are advised to use the drug under the guidance of a doctor.