Eucalyptus is widely used as a natural cold remedy and is a common ingredient in cold and cough products. Research has shown that it can decrease mucus and expand the bronchi and bronchioles of your lungs. It’s also a natural anti-inflammatory agent. The main ingredient responsible for these properties is eucalyptol, also known as cineole, which is a compound found in eucalyptus oil. Some research has shown that eucalyptol relieves cold symptoms like cough frequency, nasal congestion, and headache by decreasing inflammation and mucus buildup.

Furthermore, eucalyptol may help improve asthma symptoms. One 12-week study gave 32 people with bronchial asthma either 600 mg of eucalyptol or a placebo per day. Those in the eucalyptol group required 36% less medication to control their asthma symptoms, compared with those in the control group, who needed 7% less.

Eucalyptus oil can be inhaled through your nose and may provide some cold symptom relief. It’s also found in many topical decongestants. However, because even small doses of the oil can be toxic, you should avoid consuming it. Be sure to consult your healthcare provider before using eucalyptol or changing your medications.

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• Complementary Therapies