Lavender. 

Lavender’s perfectly balanced floral-herbaceous aroma provides an unmatched array of attributes — calming, relaxing, refreshing, toning and cleansing — making it the most popular oil in aromatherapy.

Suggested Uses: Calming Toner: 5 drops lavender, 1 tsp witch hazel extract. Soothing mist: 18 drops lavender, 1 oz water in mister.