Peppermint's origin is a mystery, but it has been in existence for a long time - dried leaves were found in Egyptian pyramids dating from around 1000 BC. It was highly valued by the Greeks and Romans, but only became popular in Western Europe in the 18th Century. Peppermint tea helps with indigestion and relaxes the muscles of the digestive tract. Peppermint's chief therapeutic value lies in its ability to relieve wind, flatulence, bloating and colic, though it has many other applications. Studies have shown that it relieves colon spasms and helps to cure ulcers. Peppermint also eases nervous headaches. Menthol, its main constituent, has antibacterial properties.