When first discovered in Australia, Eucalyptus treated everything from a cough to skin diseases. Eucalyptus leaves were minced to use for respiratory ailments, wounds, ulcers, aching joints, fevers, and dysentery. Today you could find Eucalyptus in cough syrups, toothpaste, and cosmetics.
https://simplyearth.com/products/eucalyptus-essential-oil-globulus
