Inhalation of ylang ylang essential oil was compared to music therapy for reducing high blood pressure in elderly people with hypertension. Five drops of ylang ylang essential oil were added to 20 mL of water in a diffuser and diffused four times per week for two weeks. The music therapy group participated in music therapy with sound and MP3 of Java Langgam music four times per week, for two weeks. Blood pressure was taken prior to and immediately following interventions. Both interventions reduced blood pressure during week one, with greater benefits achieved at the end of two weeks. Aromatherapy reduced systolic blood pressure better than music therapy, but music therapy was better for diastolic blood pressure.

Source: http://nursingjurnal.respati.ac.id/index.php/JKRY/article/view/578