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Gut check: can fiber supplements boost your microbiome?

NCT ID NCT05906589

Knowledge-focused Sponsor: University of Aberdeen Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now
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 This study
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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 27, 2026 · Last updated Jun 27, 2026

Summary

This study looked at how two types of dietary fiber, psyllium and inulin, affect gut bacteria and related substances in healthy adults over 60. Participants took each fiber or a placebo for two weeks, with breaks in between. The goal was to see if some people respond better to fiber than others, which could help personalize diet advice.

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

Not a phased trial

Phase numbers describe drug development. The registry uses this when they do not apply, as it does for trials of devices, procedures or behaviour changes, and for observational studies.

Participants

40 people

The number who actually took part.

Started

Sep 2023

Finished

Jul 2025

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

60 years and older

Sex

Anyone

Healthy volunteers

Accepted

You do not need to have the condition being studied to take part.

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: * \>60 years old Exclusion Criteria: Medication exclusion criteria: * Oral antibiotic use (within the past 3 months due to impact on gut microbiota). * Anti-coagulants (Warfarin). * Carbamazepine (epilepsy) * Digoxin (heart conditions) * Mesalazine (gut problems) * Regular use of anti-constipation medication/laxatives. Medical exclusion criteria: * Food allergies, self-reported food sensitivity or intolerance. * Type 1 or Type 2 diabetes. * Coeliac disease or gluten intolerance. * Metformin intake. * Bowel obstruction * Muscle weakness of the bowel * Phenylketonuria. Other exclusion criteria: * Anyone with unsuitable veins for blood sampling. * Anyone with chronic constipation (\>3 days without defaecation). * Anyone who is unable to fluently speak, read and understand English.

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As listed by the trial registrant

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

INULIN Psyllium

Contacts and locations

Locations

  • Rowett Institute

    Aberdeen, AB25 2ZD, United Kingdom

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