Peppermint oil comes from the peppermint plant, Mentha piperita. Peppermint oil has a number of different uses. It is used as a form of medical treatment for certain digestive issues such as nausea and IBS, as well as common cold and headaches. It can also be used in aromatherapy and a scenting agent in soap or other cosmetic products. It can also be applied topically for relief from itching, muscle pain and headache.