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Could a daily synbiotic capsule ease emotional and gut symptoms in ADHD?

NCT ID NCT07717359

Symptom relief Sponsor: Super Synbiotics AB 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 This study
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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 Jul 21, 2026 · Last updated Jul 22, 2026 · Updated 1 time

Summary

This study investigates whether a synbiotic supplement—a mix of probiotics and prebiotics—can improve emotion regulation and reduce gastrointestinal problems in adults with ADHD. Participants take either the synbiotic or a placebo capsule daily for 12 weeks. The main focus is on changes in emotional control and gut symptoms, exploring the connection between the gut and the brain.

What this could mean

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

Active substance
a synbiotic supplement (probiotic bacteria and prebiotics) in capsule form
What this could lead to
If it works, this could point toward a simple dietary supplement that helps adults with ADHD manage emotional symptoms and stomach discomfort.
What could go wrong
This is an early-stage trial with a moderate number of participants, and the supplement may show no benefit over placebo. Results may not apply to everyone with ADHD.

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

About 174 people

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

Expected to start

Sep 2026

An estimate. Start dates often move.

Expected to finish

Dec 2027

An estimate. End dates often move.

Lead sponsor

A company

The lead sponsor is a pharmaceutical, biotech, or medical-device company.

Who can take part

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

Ages

18 to 64 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: * ADHD-diagnosis * Self-described gastrointestinal problems * Has not previously consumed Synbiotics * Be prepared to avoid supplements with lactic acid bacteria, calcium and vitamin B6, B9, and B12, starting from washout Exclusion Criteria: * Has consumed antibiotics within the previous 6 weeks * Has a serious disease that requires treatment and/or leads to a weakened immune system

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Conditions

The condition(s) this trial relates to.

attention deficit hyperactivity disorder, inattentive type attention deficit-hyperactivity disorder digestive system disorder Emotional Regulation

As listed by the trial registrant

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

ADHD Emotion regulation abilities Gastrointestinal

How to take part

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

  1. 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 ↗

  2. A doctor treating you

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