Cinnamon is a kind of cinnamon bark, cinnamon bark refers to the bark of geranium cinnamon, Sichuan cinnamon and so on. Cinnamon belongs to the warm li medicine, the family for the camphor plant cinnamon dried bark. Cinnamon is also known as oyster cinnamon. Cinnamon is pungent, sweet and hot in nature. Cinnamon enters the liver, kidney, heart and spleen meridians. Cinnamon can be used internally and externally. Cinnamon has the effects of dispersing cold and relieving pain (relieving pain by removing cold from the body), inducing fire to return to the source (inhibiting fire from rising in the kidneys), tonifying fire and helping yang (replenishing yang qi in the body), and warming the menstruation to clear the veins. It is long used in treating impotence and spermatorrhea, deficiency of kidney yang (lack of yang qi in the kidneys), lumbar and knee soreness (a feeling of soreness and weakness in the lumbar and knee regions), coldness and coldness of limbs (fear of coldness, coldness of limbs), dysuria (uncontrolled or frequent urination), and swollen and urinary deficiency. Yin deficiency and fire (deficiency of Yin essence in the body, the emergence of excessive fire) should be avoided, bleeding tendency and pregnant women should be used with caution, should not be used with red stone resin. The adverse effects of cinnamon are not clear. If necessary, please use it under the guidance of a professional Chinese medicine practitioner.