Peppermint is not a distinct species but a sterile hybrid between spearmint (M.spicata) and water mint (M.aquatica), which must be propagated. References to the use of mint species are well documented among the ancient Greek and Roman civilizations. Peppermint essential oil reduces pain, inflammation and spasms, stimulating local blood circulation. It is used to treat muscular aches and pains, strains and sprains. It is also beneficial for acute and chronic nerve pain and inflammation such as sciatica.