Eucalyptus is a tree whose leaves and oil are used to make medications for a variety of uses, though there is little research evidence to support any of these uses, according to MedlinePlus. Eucalyptus oil must be diluted for safety reasons, and it should never be taken orally or used topically at full strength, because it can cause a fatal case of poisoning. Talk to your doctor before taking eucalyptus oil.
Asthma
There is some preliminary evidence that eucalyptol, a chemical found in eucalyptus oil, can ease asthma symptoms by breaking down mucus, making it easier to breathe, according to MedlinePlus. Some people have been able to take fewer steroid asthma medications by adding eucalyptol to their regimen. However, this benefit is still unproven. More research is needed to confirm it. If you do try eucalyptus, make sure to consult your doctor so he can monitor your condition and adjust your medication safely if needed.
Cold and Cough
Eucalyptus is a common ingredient in many over-the-counter cold and cough remedies including cough syrups and lozenges and vapor rubs, according to the University of Maryland Medical Center (UMMC). Some health-care providers also recommend applying eucalyptus oils to the chest and nose to relieve congestion and help loosen phlegm to help treat bronchitis, cough and the flu. These uses are unproven. You should talk to your doctor before using eucalyptus oil this way.
Topical Applications
Eucalyptus oil is sometimes applied to the skin to treat arthritis, boils, acne, muscle aches, burns, sores and other wounds, according to UMMC. It is also sometimes used as an insect repellent. Lab studies have shown that eucalyptus oil does seem to reduce swelling and may have antibacterial properties. There is not enough research evidence in humans on any of these uses to know whether it really works.
Other Uses
Eucalyptus oil is sometimes used to treat other conditions, such as appetite loss, liver disease, gallbladder problems, bladder issues, bleeding gums and ulcers, according to MedlinePlus. There is too little research evidence on these uses to know if there is any benefit to eucalyptus oil. It is also sometimes used to treat diabetes, and there is some evidence in mice that it may increase insulin production and lower blood sugar. But there isn't enough evidence in humans to know whether this works or is safe.
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