Gut feeling: could probiotics soothe the mind?
NCT ID NCT07751614
First seen Aug 07, 2026 · Last updated Aug 07, 2026
Summary
This study tests whether taking a probiotic supplement for four weeks can influence emotional reactions in healthy adults aged 18-30. Participants will take either a probiotic or a placebo daily and undergo virtual reality scenarios to measure emotional responses. The goal is to see if the probiotic can reduce feelings of unpleasantness in social situations, potentially offering a natural way to support mental well-being.
What this could mean
Our plain-language read of the trial. This is informational only, not medical advice or a prediction.
- Active substance
- Probiotic supplement
- What this could lead to
- If effective, this could point toward a simple, natural way to support emotional well-being in healthy people.
- What could go wrong
- This is a small pilot study, so results may not be conclusive. The effect on mental health is uncertain, and individual responses to probiotics can vary.
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
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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
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About 60 people
The number the study aims to enrol. It can still change while the study runs.
- Expected to start
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Sep 2026
An estimate. Start dates often move.
- Expected to finish
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Mar 2027
An estimate. End dates often move.
- Lead sponsor
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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
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18 to 30 years
- Sex
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Anyone
- Healthy volunteers
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Accepted
You do not need to have the condition being studied to take part.
Show the full entry requirements Hide 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: * 18-30 years of age * Native-level Danish language skills * No current psychiatric illness, confirmed with the Presence State Examination (PSE) and the Standardized Assessment of Personality (SAPAS) * No previous history of severe psychiatric illness, including bipolar disorder, recurrent unipolar depression, psychosis spectrum disorders, personality disorders, autism spectrum disorders, or attention deficit (hyperactivity) disorder (ADHD/ADD), confirmed with PSE and SAPAS. Participants may still be included if they have a history of a single depressive episode, or have experienced symptoms of anxiety, stress, or burnout more than 6 months ago. Exclusion Criteria: * Recent use of probiotics (within the past 4 weeks) * Use of antibiotics within the past 3 months * Smoking, chewable tobacco, vaping, or use of other nicotine products * Neurological disorders (including dementia) * Use of psychotropic medication within the previous 6 months, including: * Anxiolytics * Antidepressants * Antipsychotics * Anticonvulsants * Centrally acting corticosteroids * Opioid pain relievers * Hypnotics * Prescribed sleep medications or herbal sleep aids (e.g., valerian) * Dyslexia * Severe physical illness, including: * Cardiovascular disease * Diabetes * Gastrointestinal pathology (e.g., colon cancer, colitis, Crohn's disease) * Gynecological pathology (e.g., endometriosis) * Urologic pathology (e.g., prostate cancer) * Severely immunocompromised status, including: * HIV positive * Being a transplant recipient * Use of anti-rejection medication * Use of steroids for more than 30 days * Chemotherapy or radiotherapy within the last year * Current alcohol or substance abuse disorder * Previous severe head trauma * History of epilepsy * Pregnancy or breastfeeding * Known allergy to any component of the test product * Participation in a clinical study with another investigational product within 60 days before screening, or plans to participate in another study during the study period * Significant change in dietary habits within the previous 4 weeks (e.g., starting a fibre-enriched diet) * Planned major changes in diet or exercise habits during the study period * Current pregnancy
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Conditions
The condition(s) this trial relates to.
As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
How to take part
Only the study team decides who joins. These are the ways to reach them.
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The official record
ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.
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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.
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