WebMed fact: Peppermint oil is derived from the peppermint plant -- a cross between water mint and spearmint -- that thrives in Europe and North America. Peppermint oil is commonly used as flavoring in foods and beverages and as a fragrance in soaps and cosmetics. Peppermint oil also is used for a variety of health conditions and can be taken orally in dietary supplements or topically as a skin cream or ointment. Some evidence suggests that peppermint oil may help relieve symptoms of irritable bowel syndrome and indigestion. But despite promising research, there is no clear-cut evidence to support its use for other health conditions. When used as directed, dietary supplements and skin preparations containing peppermint oil are likely safe for most adults. Peppermint oil may cause side effects such as heartburn and it may interact with certain medications. Talk to your health care provider before using peppermint oil. Benefits: Cooling According to Ingrid M...