Improve blood flow to brain. Eucalyptus oil is known to be a vasodilator, meaning it dilates, or opens, blood vessels. In 1994, Austrian researchers discovered that eucalyptol, a phytochemical in eucalyptus oil (also known as 1,8-cineol), improved global blood flow to the brain after only 20 minutes of inhalation.9 A newer study released in 2016 by Korean researchers found that eucalyptol is also able to pass through the blood-brain barrier, a protective membrane that separates potentially harmful substances from harming delicate brain tissues. This research also found eucalyptol’s high antioxidant and anti-inflammatory properties to be helpful in the management of chronic conditions such as respiratory disease, cardiovascular disease, and degenerative nerve and brain diseases.10

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