Anti-diabetic Effect of Gynostemma Pentaphyllum Tea in Type 2 Diabetic Patients

December 3, 2010 updated by: Hanoi Medical University
The aim of the present study was to investigate the long-term effects on blood glucose concentrations and possible adverse effects of an extract of Gynostemma pentaphyllum (GP). This is a plant growing in the mountain regions of Northern Vietnam and previously being used in traditional medicine. The GP extract, or placebo, was randomized to newly diagnosed patients with type 2 diabetes and administered as a "tea", 3 g two times daily during 12 weeks. All patients received instructions regarding diet and physical exercise. Oral glucose tolerance tests were performed at baseline and then every 4 weeks, and blood tests were taken with the purpose to monitor lipids, kidney and liver function, body weight and blood pressure.

Study Overview

Status

Completed

Conditions

Intervention / Treatment

Detailed Description

In Vietnam, herbal extracts have been used as a long-standing tradition to treat diabetic patients, but effects of these extracts have not been studied adequately. Based on previous results in experimental animals, we have selected the plant Gynostemma pentaphyllum (GP), which grows in the mountain region of Northern Vietnam. GP extract had a hypoglycemic effect on mice and rats, and was shown to contain a substance, phanoside, which stimulates insulin secretion. In addition, GP has been shown to reduce both hyperglycemia and hyperlipidemia in diabetic Zucker fatty rats.

The present study aimed at investigate effects of GP extract, administered as a "tea", and compared with placebo in a randomized, double-blind trial in drug-naive patients with newly diagnosed type 2 diabetes. All patients also received instructions about diet and physical exercise. In addition to monitoring effects on plasma glucose regulation, we also studied possible effects on plasma lipids, kidney and liver function as well as body weight and blood pressure.

Study Type

Interventional

Enrollment (Actual)

24

Phase

  • Phase 2
  • Phase 1

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • Vietnam
      • Hanoi, Vietnam
        • National Institute of Gerontology, HMU

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

38 years to 68 years (Adult, Older Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Description

Inclusion Criteria:

  • Newly diagnosed, drug-naive patients with type 2 diabetes
  • Fasting plasma glucose (FPG) 7.0-14.0 mmol/l
  • HbA1c > 6%

Exclusion Criteria:

  • Type 1 diabetes
  • Liver failure
  • Kidney Failure

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: Double

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Active Comparator: Gynostemma pentaphyllum tea
Dietary supplement: Gynostemma pentaphyllum tea
3 grams twice daily, orally
Placebo Comparator: Placebo tea
Dietary supplement: Placebo tea
3 grams twice daily, orally

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Time Frame
Fasting plasma glucose
Time Frame: 12 weeks
12 weeks
HbA1c (glycosylated hemoglobin)
Time Frame: 12 weeks
12 weeks

Secondary Outcome Measures

Outcome Measure
Time Frame
Blood pressure
Time Frame: 12 weeks
12 weeks
Liver enzymes (ALT, AST)
Time Frame: 12 weeks
12 weeks
Kidney function (S-creatinine, S-BUN)
Time Frame: 12 weeks
12 weeks
Plasma lipids (TG, Cholesterol, HDL-, LDL-)
Time Frame: 12 weeks
12 weeks
Body weight (BMI, hip-waist ratio)
Time Frame: 12 weeks
12 weeks

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Hanoi Medical University

Collaborators

Karolinska Institutet
Swedish International Development Cooperation Agency (SIDA)

Investigators

  • Study Director: Claes Goran Ostenson, MD, PhD, Karolinska Institutet

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Helpful Links

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start

February 1, 2007

Primary Completion (Actual)

September 1, 2007

Study Completion (Actual)

December 1, 2007

Study Registration Dates

First Submitted

November 5, 2008

First Submitted That Met QC Criteria

November 5, 2008

First Posted (Estimate)

November 6, 2008

Study Record Updates

Last Update Posted (Estimate)

December 6, 2010

Last Update Submitted That Met QC Criteria

December 3, 2010

Last Verified

November 1, 2008

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • Diabetes II
  • Study 1

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

Clinical Trials on Type 2 Diabetes

Clinical Trials on Gynostemma pentaphyllum tea

Search Similar Trials

Sponsors and Collaborators

Medical Conditions

Drug Interventions

CROs by country

CROs in Dominican Republic

Conditions

Rare Diseases

Drug Interventions

Dietary Supplements

Sponsor/Collaborators

Locations

3
Subscribe