Rosemary essential oil is an excellent brain and nerve tonic. It stimulates mental activity and is a good remedy for depression, mental fatigue and forgetfulness. For cooling relief, chill it in the refrigerator (in the cover provided) for one hour or put it in the freezer for 10 minutes. Remove and gently place pillow over the eyes for a tranquil experience. Store it in the refrigerator to preserve aroma and longevity.