Its main purpose is as a chemical intermediate especially in the pharmaceutical industry for the preparation of expectorants and other medicinal compounds.

Guaiacol consists of a benzene ring substituted with a hydroxyl group (OH) and a methoxy group. This structure gives it both phenolic and ether-like properties making it reactive and useful in various chemical processes. It is naturally formed during the thermal decomposition of plant materials and contributes significantly to the flavor and aroma of smoked foods.