17 May 2007

Volunteers needed for rooibos study

Volunteers are needed to participate in a “first-of-its-kind” antioxidant research study, investigating the health benefits of the popular South African herbal tea, rooibos.

Male and female volunteers are needed to participate in a “first-of-its-kind” antioxidant research study, investigating the health benefits of the popular South African herbal tea, rooibos.

It has been suggested that the strong antioxidants in tea may lower the risk for certain chronic diseases such as heart disease and certain cancers, which are all associated with oxidative stress.

Participation requirements (only two of the risk factors below are required)

  • Age between 30 and 60
  • Elevated cholesterol levels (>5 to 7.5 mmol/L)
  • Increased body mass index (>22 to 35 kg/m2: Calculation: weight ÷ height x height)
  • Family history of heart disease

In addition to the risk factors all potential volunteers should:

  • Be medically stable with no clinical significant abnormalities of the liver, kidneys or blood
  • Female participants should not be pregnant (actual or intended)
  • Not take any chronic oral medication

All volunteers interested in this study will be screened beforehand at no cost to determine if they meet the requirements to partake in the study. Please feel free to contact us even if you do not know or are uncertain about your health status requirements for this study.


  • Participants will learn more about their own health and antioxidant status as results of all tests conducted during this study will be given to them without any costs involved
  • This research is conducted at no cost to participants
  • Rooibos tea, dietary records, tea cup and measuring utensils will be provided to all participants

In this 14-week study, participants will be required to complete food records, follow their normal diet with some beverage intake restriction and drink 6 cups of rooibos tea per day for 4 weeks thereof. Blood samples will be drawn and urine samples will be collected from participants during the study to monitor important antioxidant biomarkers. Participants will receive no monetary compensation, but will benefit by receiving their blood test results at the end of the study.

Study investigator
Dr Jeanine Marnewick (PhD, Biochemistry), Antioxidant Research Group, Faculty of Health and Wellness Sciences, Sciences Building Rm 3.73, Cape Town Campus, CPUT.

Study dates and contact information:
Please submit your contact details telephonically or via email to us before 31 May 2007 to set up an appointment:
Tel: 021-4608314 or 4603775
e-mail: or

This study has been approved by the Health and Applied Sciences Research Ethics Committee of CPUT: 11 May 2007.


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