Eucalyptus Lemon Myrtle Backhousia citriodora. Has traditionally been used for relieving chest congestion, whether in a diffuser or in a massage blend. The oil has also been known to uplift emotions as well as improving concentration. Aromatic scent: Ultra fresh and crisp potent lemon scent. More "lemony" than true Lemon oil. Caution: No known toxicity. Use diluted. Avoid during pregnancy. *Dilute with a carrier oil to minimize any skin sensitivity.