Rosemary essential oil is extracted from the leaves, flowers and buds of the plant rosemary (Rosmarinus officinalis) using steam distillation. The aroma of rosemary essential oil is herbaceous, camphorous and slightly floral. Diffusing rosemary oil in a diffuser may help increasing mental stimulation and sharpening blurry thinking. Massaging your body with diluted rosemary oil is known to reduce muscle aches and alleviate body pain. 18% GST applicable.