Terpenes are any of a large group of volatile unsaturated hydrocarbons found in the essential oils of plants, especially conifers and citrus trees. Almost all essential oils from plants contain terpenes and over 40,000 different terpenoids have been isolated and characterised from natural sources. Terpenoids, also known as isoprenoids, are a subclass of the prenyllipids (terpenes, prenylquinones and sterols).
Monotepenes are the terpenes that have been known for several centuries as components of the fragrant oils obtained from leaves, flowers, fruits and seeds of herbs and spices and fruits and vegetables. Examples of monoterpenes are camphene, carene, citral, geranoil, limonene, linalool, menthol, myrcene, nerol, phellandrene, pinene, pulegone, sabinene and terpineol.
Linalool is a critical precursor in the formation of Vitamin E and is therefore a substance that can help with the healing of injuries and surgery. Linalool is found in cinnamon, citrus fruits, mint and many other aromatic herbs.