The study will be conducted in Geriatric Outpatient Clinic of Cipto Mangunkusumo National Hospital, Jakarta, Indonesia.
Eligibility criteria are men and women over 60 years old and available to participate in the study for 4 weeks with blood pressure higher than 140/90.
Exclusion criteria are renal disease, hepatic failure, dementia and orthostatic hypotension and malignant hypertension.
Outcome measures are systolic and diastolic blood pressure after 4 weeks administration of 300 mg Nigella sativa seed extract twice daily.
