Cinnamon powder on the heart of the feet has the effect of warming the kidneys to help yang (warming and tonifying the yang qi of the kidneys), dispersing cold and clearing the veins. Cinnamon is pungent, sweet, hot, belonging to the kidney, spleen, heart, liver meridian, has the effect of tonifying fire to help yang, dispersing cold pain, warming the meridians, leading the fire back to the source, should not be used with hematite, and bleeding tendency and pregnant women should be used with caution. The heart of the foot of the Yongquan point is the foot of the Shaoyin kidney meridian, the kidney is the innate nature of the person, the main collection of essence and gas. Mixing cinnamon powder with vinegar and applying it to the Yongquan point at the center of the foot has the effect of warming the kidneys to support yang (warming and tonifying the yang qi of the kidneys), dispersing cold and clearing the veins. If you need to use this medicine, you should go to the hospital for a clear diagnosis, and then use it after the doctor has issued a prescription, do not use the medicine blindly, in order to avoid adverse effects on the body.