The uplifting and invigorating smells of peppermint are thanks to a hybrid of the watermint and spearmint plants. Peppermint helps to sooth muscles and relieve pain. Oregon is one of the top producing peppermint states in the United States. It is believed that peppermint has been used in medicine as early as 10,000 years ago. Peppermint needs moist grounds to grow, and is readily found near streams or ditches. It is also believed that peppermint helps one improve concentration and elevates moods. This herb is fantastic to help you relax, allowing your body to release all of the built up stress, and restoring your body to its natural healthy state.
http://www.medicalnewstoday.com/articles/265214.php
http://articles.mercola.com/sites/articles/archive/2013/10/14/peppermint-health-benefits.aspx