ClinicalTrials.gg
RecruitingNCT07606014NGNGPUpdated May 26, 2026

No Guts No Glory Probiotics

A Phase 2/3 interventional study of Probiotic Formula and Placebo in Patients Using Olanzapine, Quetiapine, Risperidone or Clozapine, sponsored by University Medical Center Groningen. Recruiting at 3 sites in Netherlands. Open to participants aged 18 Years to 65 Years. Per ClinicalTrials.gov, last updated 2026-05-26.

Sponsored by University Medical Center Groningen · Phase 2/3, Interventional, and Prevention

Phase
Phase 2/3
Study type
Interventional
Enrollment
112
Allocation
Randomized
Ages
18 Years to 65 Years
Sex
All
01

Study summary

The goal of this clinical trial is to learn if probiotics work to prevent or reduce metabolic side effects caused by antipsychotic medication in adults.

The main question it aims to answer is:

Do probiotics reduce weight gain, blood sugar levels, and blood fat levels in people using antipsychotics?

Researchers will compare a probiotic (Ecologic® Barrier) to a placebo (a look-alike powder without active bacteria) to see if the probiotic is effective.

Participants will:

Take either probiotics or a placebo daily for 12 weeks (3 months) Dissolve two sachets in water and drink them each morning Visit the clinic (or receive home visits) four times: at the start, after 6 weeks, and after 12 weeks, plus an initial screening visit Undergo physical measurements (e.g., weight, blood pressure), complete questionnaires, and perform a cognitive test at specific visits Provide blood samples and stool samples at the beginning and end of the study Complete two 3-day food diaries during the study

Read the detailed description

Antipsychotic medications such as olanzapine, quetiapine, clozapine, and risperidone are widely used for the treatment of psychotic and mood disorders. Although effective, these medications are frequently associated with adverse metabolic effects, including weight gain, increased blood glucose levels, and dyslipidemia. These side effects can negatively impact physical health and increase the risk of cardiovascular disease and diabetes.

Emerging evidence suggests that the gut microbiome may play a role in metabolic regulation and that modulation of gut microbiota through probiotics could mitigate antipsychotic-induced metabolic disturbances. Probiotics are live microorganisms that, when administered in adequate amounts, may confer health benefits by improving gut barrier function and influencing metabolic processes.

This study is a randomized, double-blind, placebo-controlled clinical trial designed to investigate the efficacy and safety of a multispecies probiotic formulation (Ecologic® Barrier) in preventing or reducing metabolic side effects in patients initiating treatment with antipsychotic medication. A total of 112 participants will be enrolled and randomly assigned to receive either the probiotic or a placebo for a duration of 12 weeks.

The investigational product consists of a powder formulation containing nine bacterial strains, administered as two sachets dissolved in water once daily in the morning. The placebo consists of an inert powder (e.g., maize starch and maltodextrin) with identical appearance and administration schedule. Participants, investigators, and study personnel will remain blinded to treatment allocation throughout the study.

Participants will continue their standard psychiatric treatment, including antipsychotic and/or mood-stabilizing medication, with minimal changes where possible. Concomitant use of additional psychotropic medications such as a second antipsychotic, lithium, or antiepileptic drugs is permitted.

Study procedures include baseline, interim (6 weeks), and end-of-study (12 weeks) assessments. These assessments involve physical measurements (e.g., body weight, waist and hip circumference, blood pressure), laboratory analyses of metabolic parameters using blood samples, and stool sample collection for microbiome-related analyses. In addition, participants will complete validated questionnaires assessing quality of life, eating behavior, and gastrointestinal symptoms, as well as cognitive testing at baseline and study completion.

Dietary intake will be monitored using two 3-day food diaries (pre-intervention and prior to the final visit) to account for potential dietary influences on metabolic outcomes and gut microbiota.

The primary objective is to evaluate whether probiotic supplementation reduces antipsychotic-induced metabolic disturbances compared to placebo. Secondary objectives include assessing safety and tolerability, as well as exploring changes in gastrointestinal symptoms, cognitive functioning, and potential microbiome-related mechanisms.

The total study duration per participant is approximately 3 months, with an additional optional one-month post-study probiotic use. After study completion, treatment allocation will be unblinded. Participants will be monitored throughout the study for adverse events, with particular attention to gastrointestinal symptoms, which are expected to be mild and transient.

This study aims to provide further evidence on the role of probiotics as a low-risk, adjunctive intervention to improve metabolic health in patients treated with antipsychotic medication.

02

Conditions studied

  • Patients Using Olanzapine, Quetiapine, Risperidone or Clozapine

Keywords

  • Antipsychotics
  • Probiotics
  • Psychosis
  • Schizophrenia
  • Metabolic syndrome
  • HbA1c
  • Blood glucose
  • Weight gain
  • Olanzapine
  • Quetiapine
  • Risperidone
  • Clozapine
03

In context

Psychotic Disorders

1,587 studies on the registry are indexed under Psychotic Disorders; 281 are open to participants now.

This study's planned enrollment of 112 is above the median of 65 across 1,320 interventional studies indexed under Psychotic Disorders.

Browse Psychotic Disorders studies →

Lead sponsor

University Medical Center Groningen is the lead sponsor of 627 studies on the registry; 176 are open to participants now.

Counted across the registry records on this site, refreshed daily.

04

Who can participate

Ages eligible
18 Years to 65 Years
Sexes eligible
All
Accepts healthy volunteers
No

Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.

Inclusion criteria

  1. About to start, or having started within the last 8 weeks, antipsychotic treatment with olanzapine, quetiapine*, clozapine or risperidone for treating psychosis
  2. Aged between 18 - 65
  3. No exposure to these four antipsychotic medications for longer than one week continuously in the last 6 months (except starting the treatment with the current medication 8 weeks prior to the inclusion)
  4. The participant understands the study and is able to provide written .

    • Quetiapine prescribed in a low dose for use as a sleep aid does not apply

Exclusion criteria

Exclusion Criteria:

  1. Critically ill patients (e.g. ICU), diagnosed comorbid eating disorders, chronic GI-disorders, disorders of the liver or pancreas, pre-existing diagnosed diabetes mellitus or metabolic syndrome
  2. Current use of medications known to target metabolism or weight (e.g, diabetes medication and GLP-1 agonists, proton pump inhibitors and diuretics/beta blockers) or use of antibiotics or probiotics (such as Yakult, Activia, or other probiotic supplements containing ≥10⁹ CFUs) in the past 4 weeks
  3. Pregnancy or breastfeeding
  4. Inability to follow the intervention or other conditions that according to the investigator might interfere with the evaluation of the study objectives as judged by the treating physician
Terms in these criteria, in plain language(1)

Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.

Informed consent

Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.

You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.

05

Study design

Phase
Phase 2 / Phase 3
Primary purpose
Prevention
Allocation
Randomized
Intervention model
Single group
Masking
Triple (Participant, Care provider, Investigator)
Enrollment
112 participants (estimated)

Study arms

  • Experimental
    Probiotic intervention

    This group uses a probiotic formulation to prevent metabolic risk factors of antipsychotics

    Dietary Supplement: Probiotic Formula

  • Placebo comparator
    Placebo

    This group uses a placebo

    Dietary Supplement: Placebo

Interventions

  • Dietary supplementProbiotic Formula

    After informed consent, participants will be randomized 1:1 to either: * Intervention group: Ecologic® Barrier * Control group: Placebo powder (identical in appearance, taste, and packaging but without active bacterial strains) Ecologic® Barrier * Dosage form: Powder formulation containing a multi-strain probiotic mixture * Dosage: Standard manufacturer-recommended dose per sachet * Frequency: Twice daily (morning and evening) * Route of administration: Oral, dissolved in water or another non-carbonated beverage * Duration: 12 weeks (3 months) * Distinguishing characteristics: * Contains a defined combination of probiotic strains specifically formulated to support gut ba- rrier integrity * Delivered as a powder sachet to ensure stability of live bacterial cultures * Designed to modulate gut-brain axis pathways relevant to antipsychotic-associated metabolic effects

    Also known as: Ecologic Barrier

  • Dietary supplementPlacebo

    * Dosage form: Powder identical in appearance, texture, and packaging to the active product * Dosage: One sachet per administration * Frequency: Twice daily * Route of administration: Oral * Duration: 12 weeks * Distinguishing characteristics: * Contains no active probiotic strains * Formulated to match the organoleptic properties of Ecologic® Barrier to maintain blinding

    Also known as: Placebo formulation

06

What researchers measure

Primary outcomes

  1. Hemoglobin A1C

    Average blood glucose levels during the past 2 or 3 months

    Time frame: From enrollment to the end of treatment at 12 weeks

07

Study locations

3 of 3 sites recruiting
  • KieN VIP Leeuwarden
    Leeuwarden, Provincie Friesland 8911KJ, Netherlands
    Recruiting
  • University Medical Center Groningen
    Groningen, Provincie Groningen 9713GZ, Netherlands
    Recruiting
    • Toon A.W. Scheurink, MSc · Contacta.w.scheurink@umcg.nl · +31681528283
    • Iris E.C. Sommer, MD, PhD · Principal investigator
  • Antes Parnassia Groep
    Rotterdam, South Holland 3083AK, Netherlands
    Recruiting
    • Yunus A.W. Yalcin, PhD · Contacty.yalcin@parnassiagroep.nl · +310613434115
    • Nico van Beveren, MD, PhD · Principal investigator
08

References and documents

Individual participant data

Plan to share: Undecided

No publications or documents are linked to this record.

09

Timeline

Tracking since Sep 25, 2026
ElapsedEstimatedEstimated, not yet reached

Start is estimated for Jun 2026; primary completion for May 2029, 35 months later.

How these figures are worked out, and which studies are left out of them.

Registered
May 18, 2026
First posted
May 26, 2026
StartEst.
Jun 1, 2026
Primary completionEst.
May 1, 2029
CompletionEst.
May 1, 2029
Last update
May 26, 2026
What these dates mean
Start.
When the first participant enrolled; while estimated, when the study expects to open to recruitment.
Primary completion.
When the last participant was examined or treated to collect data for the study's main question, its primary outcome. A study that stopped early gives the date its data collection stopped.
Completion.
When the last participant's last visit took place, for every outcome, secondary ones and side effects included: the end of the study. Often later than primary completion, sometimes the same day.
Actual and Est.
Actual means the registry says the date has happened. Est. (estimated) is a date the sponsor plans or expects. It can still move, and the sponsor is expected to change it to actual once it has passed.
No changes since tracking began. The registry record was last updated on May 26, 2026, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
10

Registry details

Key details

Study ID
NCT07606014
Collaborators
The Dutch Brain Foundation (funding), Parnassia Groep, KienVIP
Responsible party
Sponsor
First posted
May 26, 2026
Start date
Jun 1, 2026 (estimated)
Primary completion
May 1, 2029 (estimated)
Completion
May 1, 2029 (estimated)
Last update
May 26, 2026

Study contacts

Toon A.W. Scheurink, MSc
Contact
a.w.scheurink@umcg.nl
+31681528283
Iris E.C. Sommer, Prof. Dr.
principal investigator · University Medical Center Groningen

Oversight

Data monitoring committee
No
FDA-regulated drug
No
FDA-regulated device
No
View the source record on ClinicalTrials.gov ↗

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