Menthol crystals are natural, aromatic compounds derived from mint oils, typically peppermint. They have a strong, cool, minty scent and are widely used in products like ointments, lotions, toothpaste, and cough drops for their soothing, cooling effect. Menthol crystals are also used in aromatherapy and to enhance the flavor of foods and beverages. They dissolve easily in alcohol or oils but remain solid at room temperature.