Propylene glycol is a chemical raw material, it is not a component in alcohol, but an additive in many daily products, which is not too dangerous and harmful to the body, and is mainly used in the emulsification process of cosmetics as a raw material for cosmetic production. It can also be used to add in toothpaste, soap and other daily products as a kind of emulsifier, it is also very good adhesion and wet application, in the field of medicine and industry also has a wide range of applications. In addition, it is also a lubricant and can be used as a lubricant. However, propylene glycol can also cause some threat and harm to the body if applied in excess. If you are allergic to this drug or this variety, you should not use it. It will burn and scorch the skin and cause skin rash, allergy, itching, etc.