Effect of a Food Supplement on Glycemic Parameters in Patients With Impaired Glucose Metabolism

November 23, 2025 updated by: Giuseppe Derosa, Fondazione IRCCS Policlinico San Matteo di Pavia

Evaluation of the Efficacy of GlycoDual on Postprandial Glycemic Control and Insulin Sensitivity in Subjects With Impaired Glucose Metabolism: a Randomized, Controlled, Double-blind Study

The primary objective will be to evaluate the efficacy of GlycoDual in reducing fasting plasma glucose (FPG) and post-prandial plasma glucose (PPG) levels compared to placebo after 90 days of treatment.

Secondary objectives are to estimate:

  • the change of insulin sensitivity (HOMA-IR)
  • the change of uricemia after 90 days of supplementation compared to placebo.

Safety objectives: Collection of the adverse events not related, related or possibly related to the study products.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Not yet recruiting

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Detailed Description

Mild dysglycemias, such as impaired fasting glucose (IFG) and impaired glucose tolerance (IGT), represent pre-diabetic conditions characterized by a subclinical impairment of insulin sensitivity and β-cell function. Early intervention in this phase can prevent or delay the progression to full-blown diabetes. In this context, the use of nutraceutical supplements with physiological activity on glucose metabolism represents a promising and well-tolerated approach, able to effectively modulate metabolic parameters, with a good safety profile. GlycoDual is a food supplement developed to control post-prandial glycemia and improve insulin sensitivity in subjects with impaired glucose metabolism. GlycoDual contains maqui berry, blueberry, cocoa (rich in anthocyanins and epicatechin), and chromium picolinate, aimed at modulating the immediate glycemic response through the inhibition of α-glucosidase, stimulation of glucose transport and insulin sensitization. It also contains Gymnema sylvestre and zinc bisglycinate, aimed at supporting insulin secretion and contributing to the long-term regulation of glycemia The primary objective will be to evaluate the efficacy of GlycoDual in reducing fasting plasma glucose (FPG) and post-prandial plasma glucose (PPG) levels compared to placebo after 90 days of treatment.

Secondary objectives are to estimate:

  • the change of insulin sensitivity (HOMA-IR)
  • the change of uricemia after 90 days of supplementation compared to placebo.

Safety objectives: Collection of the adverse events not related, related or possibly related to the study products.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Interventional

Enrollment (Estimated)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
90

Phase

Phase

The stage of a clinical trial studying a drug or biological product, based on definitions developed by the U.S. Food and Drug Administration (FDA). The phase is based on the study's objective, the number of participants, and other characteristics. There are five phases: Early Phase 1 (formerly listed as Phase 0), Phase 1, Phase 2, Phase 3, and Phase 4. Not Applicable is used to describe trials without FDA-defined phases, including trials of devices or behavioral interventions.
  • Not Applicable

Contacts and Locations

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

Study Contact

Study Contact

The name and contact information for the person who can answer enrollment questions for a clinical study. Each location where the study is being conducted may also have a specific contact, who may be better able to answer those questions.

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

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  • body mass index (BMI) 25.0-29.9 kg/m2
  • FPG levels between 100 and 125 mg/dl [IFG diagnosed after Oral Glucose Tolerance Test (OGTT)]
  • HOMA-IR > 2.5
  • subjects able to understand the informed consent and sign it before enrollment in the study

Exclusion Criteria:

  • personal history of cardiovascular disease or equivalent risk factors
  • obesity (BMI ≥ 30 kg/m²)
  • taking hypoglycemic drugs or supplements that affect glycemic metabolism
  • diabetes mellitus or IGT
  • pregnancy or breastfeeding
  • known thyroid, liver, kidney or muscle diseases
  • any medical or surgical condition that makes patient compliance with the study protocol complex or inconsistent
  • any known allergy or hypersensitivity to one or more components of the food supplement

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

Participant Group / Arm

A group or subgroup of participants in a clinical trial that receives a specific intervention/treatment, or no intervention, according to the trial's protocol.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Placebo Comparator: Placebo
Patients taking placebo
Other: Placebo
Placebo
Active Comparator: Intervention
Patients taking nutraceutical
Dietary supplement: GlycoDual
GlycoDual is a food supplement developed to control post-prandial glycemia and improve insulin sensitivity in subjects with impaired glucose metabolism. GlycoDual contains maqui berry, blueberry, cocoa (rich in anthocyanins and epicatechin), and chromium picolinate, aimed at modulating the immediate glycemic response through the inhibition of α-glucosidase, stimulation of glucose transport and insulin sensitization. It also contains Gymnema sylvestre and zinc bisglycinate, aimed at supporting insulin secretion and contributing to the long-term regulation of glycemia

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
Effects on glycemia
Time Frame: 90 days
evaluate the efficacy of GlycoDual in reducing fasting plasma glucose (FPG) and post-prandial plasma glucose (PPG) levels compared to placebo after 90 days of treatment.
90 days

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Measure Description
Time Frame
Change in Insulin sensitivity
Time Frame: 90 days
The secondary objective will be to evaluate the efficacy of GlycoDual in reducing insulin sensitivity (HOMA-IR) levels compared to placebo after 90 days of treatment.
90 days
Change in uricemia
Time Frame: 90 days
The secondary objective will be to evaluate the efficacy of GlycoDual in reducing uricemia levels compared to placebo after 90 days of treatment.
90 days

Collaborators and Investigators

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

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
Fondazione IRCCS Policlinico San Matteo di Pavia

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 (Estimated)

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
December 1, 2025

Primary Completion (Estimated)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
January 31, 2026

Study Completion (Estimated)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
February 28, 2026

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
November 23, 2025

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
November 23, 2025

First Posted (Estimated)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
December 4, 2025

Study Record Updates

Last Update Posted (Estimated)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
December 4, 2025

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
November 23, 2025

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
November 1, 2025

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • GDUAL-2025-RCT01

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

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.

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