(Mentha spicata) aka: Curled Mint, Fish Mint, Garden Mint, Green Mint, Lamb Mint, Mackerel Mint, Our Lady's Mint, Sage of Bethlehem, Spire Mint.  Spearmint is considered a remedy for indigestion and gas, although its effectiveness has not been officially recognized.

This member of the mint family has been held in high regard since Roman times. The ancients believed that it kept milk from souring, and used it as a bath additive, gargle, washing agent, and remedy for bee and wasp stings. The herb is named for Menthe, a nymph who, according to legend, was turned into a plant by the goddess Persephone when she learned of Pluto's love for the girl.

Spearmint contains an essential oil called Spearmint oil. The chief constituent is carvone which sometimes causes allergy in users of Spearmint preparations. Also present are Phellandrine, Limonene, and Dihydrocarveol acetate, esters of acetic, butyric and caproic or caprylic acids. 

Spearmint is chiefly used for culinary purposes, but it is also used in the aroma and flavor industry. Spearmint is also used to relieve hiccough, flatulence, nausea, vomiting and colic pain. It is also used to treat painful haemorrhoids and for rheumatism.  Spearmint also has antifungal, antiviral, antimicrobial, insecticide, antioxidant, antiamebic, antihemolytic, allergenic, CNS depressant, antihelmintic and antiancylostomiasis activities.

The medicinal oil of Spearmint is extracted from the above-ground parts of the plant by steam distillation. Today, it is used primarily as a flavoring agent in toothpaste, chewing gum, and certain food preparations. Unprocessed Spearmint leaves are used as a remedy for gas.

There are no known medical conditions preclude the use of Spearmint.  Special Precautions:  There is a slight possibility of developing an allergy to Spearmint oil. Aside from that, the herb appears to be safe.