Eucalyptus oil's history of medicinal use dates back to the days of Indigenous Australians, who used both the leaves and the roots of the plant as medicines. When English colonists began to arrive in Australia in the late 1700s, they quickly adopted eucalyptus oil as a medicinal treatment themselves. In fact, when Surgeon-General John White arrived in 1788, he took an interest in eucalyptus almost immediately, according to entries in his diary.The...