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Gut check: probiotics may give runners an edge

NCT ID NCT07411482

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

What the study statuses mean

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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 This study
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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 24, 2026 · Last updated Jun 27, 2026 · Updated 1 time

Summary

This study looks at whether taking probiotics for 4 weeks, along with a personalized diet, can improve endurance and gut health in marathon runners. Researchers will measure oxygen use, inflammation, and gut bacteria in 27 male runners. The goal is to see if these changes help with running performance.

What this could mean

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

Active substance
probiotic mixture (Sanprobi Active & Sport)
What this could lead to
If successful, this could show that probiotics combined with a personalized diet improve endurance and reduce inflammation in athletes.
What could go wrong
This is a small, early-stage study with only 27 participants, so results may not apply to all runners. The effect of probiotics on performance is still uncertain.

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

27 people

The number who actually took part.

Started

Dec 2023

Expected to finish

Mar 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

18 to 45 years

Sex

Male participants only

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: * Endurance-trained adult men (aged ≥ 18 years) * Long-distance runners with experience in at least three marathons or half-marathons * Average running speed between 10.549 and 14.065 km/h * At least 3 years of regular endurance training experience * Completion of 5 or more training sessions per week Exclusion Criteria: * Age below 18 years * Female gender * Antibiotic therapy within the last 3 months * Diagnosed inflammatory bowel disease * Chronic musculoskeletal injuries within the last 6 months * Heart failure or heart defects

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As listed by the trial registrant

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

Intestinal microbiome Probiotic Runners

Contacts and locations

Locations

  • Medical University of Gdańsk

    Gdansk, Poland

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