The main component of deer tendon is collagen, also contains inorganic elements, hormones, etc. Collagen is its main pharmacological active ingredient. Deer tendon has certain effects of replenishing labor and renewing extinction, strengthening tendons and bones. It is salty in taste, warm in nature, and belongs to the liver and kidney meridians. It can strengthen the tendons and bones, nourish the blood and channels (replenish the blood and dredge the meridians), and produce essence and marrow, and can be used to assist in the treatment of those who have suffered from rheumatism for a long time, with pains in joints, pains in the lumbar and spinal columns, fatigue or weakness of the tendons and bones, difficult walking, weakness of the hands and feet, cramps of the hands and feet, and soreness of the tendons and bones. The adverse reactions and contraindications of this product are not clear. Discomfort should seek medical attention in time, under the guidance of physician’s identification and selection of medication, do not self-medication, so as not to delay the condition.