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Could a fiber supplement boost Metformin's power in obese teens?

NCT ID NCT04578652

Disease control Sponsor: University of Alberta Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now This study
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Jun 26, 2026 · Last updated Jun 27, 2026 · Updated 1 time

Summary

This study tests whether adding a daily fiber supplement to metformin helps improve insulin resistance and weight loss in teenagers aged 12-18 with severe obesity and a family history of type 2 diabetes. 90 participants will be randomly assigned to receive metformin alone, fiber alone, or both for 12 months. The goal is to see if the combination works better than either treatment alone.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

Active substance
metformin and a fiber supplement (oligofructose, resistant maltodextrin, acacia gum, PGX)
What this could lead to
If it works, this could point toward a simple, low-cost way to improve insulin sensitivity and reduce weight in adolescents with obesity.
What could go wrong
This is a relatively small, single-center trial. The combination may not be more effective than metformin alone, and the high fiber dose could cause digestive discomfort.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Phase

Phase 3

Large-scale testing in a bigger group. Usually the last step before a treatment can be approved.

Participants

About 90 people

The number the study aims to enrol. It can still change while the study runs.

Started

Oct 2021

Expected to finish

Sep 2026

An estimate. End dates often move.

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Ages

12 to 18 years

Sex

Anyone

Healthy volunteers

Not accepted

This study is not open to healthy volunteers. The entry requirements below say who it is open to.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: 1. Age 12-18 years 2. BMI percentile \> 95% for age/sex; 3. Total weight fluctuation over past 6 months \< 10%; 4. HOMA-IR \> 3.16; 5. FH of T2DM (first or second-degree relative). Exclusion Criteria: 1. Current use of insulin or diagnosis of T2DM; 2. Systolic or diastolic blood pressure (BP) \> 99th percentile for age and sex; 3. Acute infectious or inflammatory condition over the preceding 1 month; hospitalization \> 48 hrs; 4. History of chronic disease such as inflammatory bowel disease, chronic severe liver or kidney disease or neurologic disorders; 5. Active malignancy; 6. Concomitant use of medication/investigational drug known to affect body weight in the past year; 7. Antibiotic use in past 60 days; probiotic and/or prebiotic supplements use in the past 30 days; use of lipid-lowering and anti-inflammatory medication.

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Conditions

The condition(s) this trial relates to.

Insulin Resistance obesity disorder Pediatric Obesity

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Insulin resistance Obesity, childhood

How to take part

Only the study team decides who joins. These are the ways to reach them.

  1. The places running it

    1 site. The list below names each one and where it is.

  2. The official record

    ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.

    Open the record ↗

  3. A doctor treating you

    A doctor who knows your case can contact a study site on your behalf, and can tell you whether this study is worth pursuing at all.

Contacts and locations

Locations

  • University of Alberta

    RECRUITING

    Edmonton, Alberta, T6G 2E1, Canada

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