Eucalyptus globulus

One of the tallest trees in the world, it originated in Australia and later grew in Tasmania ,China, USA, Brazil and the Mediterranean. There are something like 200 species. The Aborigines may have been the first to use it medicinally.

Therapeutic effects: The principal constituent of the oil is the antiseptic eucalyptol. Combined with its anti-inflammatory properties, eucalyptus oil is particularly helpful for asthma, bronchitis, flu, sinusitis, skin infections, rheumatism and sores. It can also reduce fever, is a strong diuretic and its headclearing  qualities are well-known.

Uses: Baths, inhalation and massage. It has a cooling effect on body temperature, reduces fever and is also a remedy for muscular/rheumatic aches an pains. It is widely used in cold and cough medicines and rubs. Use in the bath to relieve cystitis or on a handkerchief to clear the head.

Other popular ways apart from the above include, diffusers, on your pillow at night, meditation, car air fresheners and in steam / saunas.