Menthol is an organic compound made from peppermint or other mint oils. Menthol crystals, which are a clear or white crystalline substance, are solid at room temperature and melt just above room temperature, making it easy to add to liquids such as warm water or warm coconut oil to create mentholated preparations.

Often found in mouthwashes, toothpaste, balms, and a host of other products, menthol is the primary active ingredient in essential oil of peppermint that provides the familiar cooling sensation and minty odor and taste.