Eucalyptus - Acts as an antiseptic, antiviral, bactericidal, decongestant, expectorant and insecticide. It is used to help athlete's foot and other fungal infections. It is often used for colds, fevers, asthma, laryngitis and sore throat. Inhaling eucalyptus steam may help bronchitis and asthma. Its aroma aids memory and promotes positive feelings.