Peppermint also known as Mentha piperita, White Peppermint, American Peppermint, Northern Mint, Lamb Mint, Brandy Mint, and Black Peppermint. The essential oil of peppermint (up to 2.5% in the dried leaf) is mostly made up from menthol (ca. 50%), menthone (10 to 30%), menthyl esters (up to 10%) and several monoterpene derivatives (pulegone, piperitone, menthofurane). Traces of jasmone (0.1%) give the oil its characteristically “minty” scent. The aromatic chemicals in the mint are concentrated when the plant is grown in areas with long, warm, bright summer days. Medicinally, the German Commission E has approved peppermint leaf for supporting the gastrointestinal tract as well as the gallbladder and bile ducts.