Eucalyptus Globulus Essential Oil is widely used as a decongestant inhalation for colds and catarrh, but it has many other less known uses. Most important of these is its very powerful bactericidal and anti-viral action. A steam inhalation with Eucalyptus Globulus Essential Oil is an effective natural treatment for colds, because it not only eases nasal congestion, but inhibits proliferation of the cold virus.