Rosemary essential oil contains some helpful properties that encourage your hair growth. This conclusion is supported by a research on the effect of rosemary on the hair growth process, which shows an outstanding improvement of hair growth after six months using rosemary essential oil  . This oil is believed to help stimulate your blood circulation and promotes the cell division so that it can make contributions your eyebrow growth. To use this method, let mix this oil and olive oil and apply it on your eyebrows as usual. Carefully take a patch test before deciding using it on your face.