Menthol, also known as menthol, is a terpene organic compound with the chemical formula C10H20O. Menthol is extracted from the leaves and stems of peppermint, and is a white crystalline substance that is the main ingredient in peppermint and spearmint essential oils. Menthol generally has two isomers (D-type and L-type), the natural menthol is mainly the left isomer (L-menthol), and the menthol here generally refers to the dextrorotatory menthol (DL-menthol).

Menthol is used as a flavor enhancer in toothpaste, perfumes, beverages and candies. In medicine, it is used as a stimulant, acting on the skin or mucous membranes, with a cooling and itching effect. Internally, it can be used as a wind-repellent drug for headaches and inflammation of the nose, throat and larynx. Its esters are also used in spices and medicines.

Menthol and menthol are used as flavoring agents in toothpaste, perfume, beverages and candies. In medicine, it is used as a stimulant, acting on the skin or mucous membranes, and has the effect of cooling and relieving itching; internally, it can be used as a wind-expelling drug for headache and inflammation of nose, throat and larynx. Its ester is used in spices and medicines. In the world, China and Brazil are the main natural mint production garden, the annual output of peppermint oil have reached 2000-3000t.