Cinnamon

Cinnamomum zeylanicum

The Chinese believed that no remedy or treatment was complete without cinnamon. It is on of the oldest spices known-used bu the Egyptians, Romans and Greeks and it was also mentioned in the Old Testament.
Therapeutic effects: Useful for fatigue and depression, it is also a tonic for respiratory and digestive systems, especially useful for coughs, colds, flu, stomach ache and diarrhoea. An aphrodisiac, it may also help impotence.
Uses: Inhalation and massage. Burn to prevent the spread of flu virus or add bark or oil to spice up a pot pourri. To relieve muscular spasms use in a compress or massage.
Other popular ways apart from the above include, diffusers, on your pillow at night, meditation, car air fresheners and in steam / saunas.
Cautionary note: Use only in very low concentrations or under professional advice.