Pulegone

Pulegone is a natural monoterpene ketone found in essential oils, most notably in pennyroyal oil (Mentha pulegium) and to a lesser extent in peppermint oil. Its chemical formula is C10H16O, and it is typically described as a colorless to pale-yellow liquid with a peppermint-like odor. Pulegone is one of the principal constituents of pennyroyal oil and contributes to the characteristic aroma of many mint-derived essential oils.

Chemically, pulegone features a cyclohexanone ring with an exocyclic isopropenyl substituent and a methyl group. It is classified as a monoterpene and serves as a biosynthetic precursor to other mint oil components in the plants that produce it.

Production and use: Pulegone occurs naturally in certain Mentha species and is encountered in some fragrance and flavor formulations as a component of essential oils. Because of safety concerns, its use is highly regulated. In many jurisdictions, pennyroyal oil and essential oils with high pulegone content are not approved for internal use and are restricted in cosmetic and food applications. The regulatory stance reflects concerns about potential toxicity rather than a legitimate cosmetic or culinary benefit in high concentrations.

Safety and regulation: Pulegone has been associated with hepatotoxicity and severe liver injury in cases of high-dose exposure, particularly from ingestion of pennyroyal oil. There have been reported fatalities linked to such exposure. Because of these risks, products containing pulegone are typically not recommended for ingestion, and exposure should be limited, especially for pregnant individuals or those with liver sensitivity. Regulatory agencies continue to monitor and restrict pulegone levels in consumer products.

See also: Mentha species, essential oils, monoterpenes.