Nettle

Nettles are native to Europe and have antirheumatic, blood-purifying and detoxifying properties. It may be used for eczema, as well as being applicable as a gurgling solution in cases of aphthous oral infection and gum infections.
In aromatherapy, it is effective against mental fatigue.

see Markus Schirner 2002, "Aroma-Öle", Schirner Verlag, Darmstadt, 4. Edition 2011