Menthol, also known as menthol alcohol, is a terpene organic compound with the chemical formula C10H20O. Menthol can be used as a flavoring agent in toothpaste, perfumes, beverages and candies, etc. It is used as a stimulant in medicine, acting on the skin or mucous membranes, and has a cooling and anti-itching effect. It can be taken internally as a wind-dispelling medicine and is used for headache and rhinitis, pharyngitis, laryngitis, etc. Its esters can also be used in spices and medicines.