Fresh, green and enlivening, Rosemary is uplifting and refreshing for the mind, renewing enthusiasm and clearing mental fatigue. A powerful stimulant, Rosemaryu0027s popularity as a hair tonic has increased in recent years because of its ability to improve scalp circulation, which can encourage the growth of thicker, stronger hair. Rosemary essential oil is an effective mental stimulant, useful for improving concentration, and even thought to aid memory. Its ability to refresh the mind and revive mental clarity makes it the perfect oil to use during work, study or when you need to concentrate on a task. A natural expectorant with anti-inflammatory properties, Rosemary oil can help loosen physical congestion caused by allergies, colds or flu. Its anti-inflammatory properties, Rosemary can help loosen physical congestion caused by allergies, colds and flu. It can also help to reduce soreness, pain and inflammation in joints and muscles when used in a massage oil.