This natural oil not only smells better than menthol, but it may be more effective at relieving congestion, London says. When you start to feel stuffed up, fill a bowl with warm water and a few drops of eucalyptus oil, soak a washcloth in it and then put that over your face or bring it into the shower. To help sick family members find relief, London sometimes puts a small amount of diluted eucalyptus oil in a bedroom humidifier. Eucalyptus oil can also be used on the skin to treat arthritis, boils, sores and wounds, and as an all-natural insect repellent.
Caution: Eucalyptus oil can be toxic when ingested, so never drink it or put it near the face of children under the age of 2.