Olive Leaf Extract Study


It is well known that the Mediterranean diet is associated with a long healthy life and olives and olive oil are important components of this diet. Olive leaves contain the same beneficial plant compounds found in these foods and have been used for hundreds of years in folk medicine to treat a variety of illnesses. Heart disease is a leading cause of death in New Zealand and high blood pressure is an important risk factor. Research has shown that 37% of New Zealanders have high blood pressure.

Massey University is conducting an intervention trial to determine whether olive leaf extract supplementation can reduce blood pressure and other heart disease risk markers. The study will take place at Massey University’s Albany campus starting in March 2013.

Who can take part?

We are looking for 60 healthy male volunteers
to participate in this study. To take part you should:
     Be male aged 18-65 years
     Be a non-smoker
     Not be taking any regular medication

What does the study involve?

Study participants will


  • Be given olive leaf extract liquid and a placebo liquid to consume at home daily for 6 weeks each, separated by a 4 week break. Total length of study participation is approx 4 months.
  • Attend 4 x 1.5hr appointments at Massey University’s Human Nutrition Research Unit (at weeks 0, 6, 10 and 16) which will involve:
  • Bringing a urine sample into the Nutrition Unit
  • Having a blood sample taken
  • Having the elasticity of your blood vessels measured (non-invasively)
  • Height, weight and body composition measurements
  • Complete a quick online questionnaire each week
  • Wear a blood pressure monitor for 24 hours at home four times during the study

Please note that this is an Auckland-based study, and all appointments will take place at Massey University’s Albany campus.

Human Ethics approval

This project has been reviewed and approved by the University of Reading (UK) Research Ethics Committee, Reference UERC 13/02.

Registration of interest

 Register your interest online


For any other enquiries, please email Stacey Lockyer or call 094140800 ext 41183.

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