When ingested in small quantities, peppermint oil is thought to relax the muscles of the digestive tract, making it easier for gas and food to pass through. Peppermint tea, on the other hand, is made by steeping peppermint leaves in hot water, and it has many of the same digestive benefits as peppermint oil. I recommend using peppermint leaves for your tea. You’ll get a better flavor and it’s not quite as concentrated as an oil.