ESSENTIAL OIL OF ROSEMARY from Arganour , a 100% pure oil. Rosemary essential oil is extracted by vaporizing rosemary leaves. The greenish leaves of rosemary are aromatic and its essential oil has many very beneficial properties for health. One of the most popular properties of rosemary essential oil is linked to increased memory, improved concentration and drowsiness. Thanks to its stimulating and tonic effects, it promotes blood circulation and helps to strengthen the body's immune system, acting as a prevention of respiratory and digestive diseases. It also has diuretic and anti-liver properties. Dropper format.