The efficacy of cinnamon in water is to tonify fire and help yang (replenish yang qi in the body), draw fire back to the source (inhibit the rising of fire evil in the kidneys), etc. It has the effect of relieving impotence and uterine coldness, cold pain in lumbar and knee, and deficiency of the kidneys as asthma. Contraindications are unclear. Cinnamon is the dried bark of Cinnamomum cassiae, family Camphoraceae. It is pungent, sweet and hot in nature, and belongs to the kidney, spleen, heart and liver meridians. It has the effects of tonifying fire and assisting yang, inducing fire to return to the source of energy, dispersing cold and relieving pain (relieving pain by dispelling cold in the body), and warming the meridians and channels. It is used in treating impotence and coldness in the 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 and redness of the eyes, 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, abdominal pain due to coldness of the internal organs and feeling of coldness of the wind from the external sources, and menstrual dysmenorrhea and menstrual occlusion. The adverse reactions and contraindications of the drug are not clear, but when using it, it should be noted that cinnamon is very hot, so people with bleeding tendency and pregnant women should be cautious, and should also avoid using it with red stone resin. The efficacy of taking it in water is limited, and it can’t replace the medication to treat the disease. If necessary, it is recommended to go to a regular hospital, under the guidance of a professional physician to identify the treatment.