Collateral oil is mainly composed of turpentine, eucalyptus oil, menthol, methyl salicylate, clove oil, camphor, cinnamon oil, thymol and capsanthin as auxiliary materials. These raw materials are cool and easily absorbed by the human body. After entering the human body, it can relax tendons and activate collaterals, dispel wind and dissipate blood stasis. Can be used for the treatment of rheumatic bone pain, muscle and bone pain, lumbar spine tingling, traumatic injury, small sore swelling and pain, skin itching, mosquito bite, dizziness and abdominal pain. The cool ingredients in collateral oil can also help obese people lose weight by promoting human digestive function.