Mint is well known for its properties related to indigestion, stomach cramps, menstrual cramps, flatulence, upset stomach, nausea, vomiting, and colic in children. Mint oil used externally in a cold compress or rubbed directly into the skin can significantly reduce pain in cases of arthritis and chronic joint pain, with few if any side effects. If Spearmint is being grown as a medicinal herb, for the sake of the volatile oil to be extracted from it, It is estimated that 350 lb. of Spearmint yield 1 lb. of oil. The chief constituent of Spearmint oil is Carvone. There are also present Phellandrine, Limonene and dihydrocarveol acetate. Esters of acetic, butyric and caproic or caprylic acids are also present.