ClinicalTrials.gg
RecruitingNCT06211062Updated Mar 4, 2025

The Use of Directed Probiotics in ME/CFS: Myalgic Encephalomyelitis/Chronic Fatigue Syndrome

A Phase 2 interventional study of Floradapt Intensive GI and Placebo in ME/CFS and IBS - Irritable Bowel Syndrome, sponsored by Nova Southeastern University. Recruiting at 1 site in United States. Open to participants aged 45 Years to 70 Years. Per ClinicalTrials.gov, last updated 2025-03-04.

Sponsored by Nova Southeastern University · Phase 2, Interventional, and Treatment

From the registry’s dates

  • Primary completion was expected by Feb 2026, 8 months ago, but the record still lists the study as recruiting.
  • Registered 7 months after the study started (first participant enrolled Dec 2022, registered Aug 2023).
  • Started Dec 2022; still recruiting 3 years 10 months later.

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Phase
Phase 2
Study type
Interventional
Enrollment
100
Allocation
Randomized
Ages
45 Years to 70 Years
Sex
All
01

Where this study stands

Counted across the records on this site · 2026-11-13

Among 86 studies in Fatigue Syndrome, Chronic with a site in United States — 21 open to participants now, 24 under way, none of them phase 3. Fatigue Syndrome, Chronic · United States.

Planned enrollment
15th of 58
100 · median 50
Started
2022
with 4 others
Phase 2
12 of 86
4 open now
Primary completion
2026-02
later than 5 of 23 live
Registered
70th of 86
by date

Among the 86 studies in Fatigue Syndrome, Chronic with a site in United States, this one is the 15th largest by planned enrollment of the 58 interventional ones that give a count, is one of 5 that started in 2022, is one of 12 in phase 2, reaches primary completion later than 5 of the 23 other live ones, and was the 70th registered.

Fatigue Syndrome, Chronic

264 studies on the registry are indexed under Fatigue Syndrome, Chronic; 62 are open to participants now.

Browse Fatigue Syndrome, Chronic studies →

Open to participants now

21 of the 86 studies in Fatigue Syndrome, Chronic with a site in United States are open now. Recruiting first, the newest first:

15 more — sign in →

All 21 open studies →

A study can be open while its sites in United States have not opened yet or have stopped. Only those recruiting at a site in United States →

Who these studies take

Of the 44 Fatigue Syndrome, Chronic studies recruiting now, 18 (41%) set no upper age limit and 20 (45%) stop at 75 or younger; 5 take children under 18; 10 take healthy volunteers.

This study: 45 Years to 70 Years · all sexes · no healthy volunteers.

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02

Study summary

This clinical study aims to evaluate the use of i3.1 probiotic in participants who meet the Institute of Medicine (Canadian Consensus Criteria) case definition for ME/CFS and who may or may not be diagnosed with irritable bowel syndrome (IBS). The main questions it aims to answer are:

  • how effective is the usage of the i3.1 probiotic to reduce gastrointestinal (GI) inflammation and normalize the GI and systemic/brain interface?
  • how well is it working on IBS severity? The study sample is 100 male and female participants aged 45 to 70 years with ME/CFS (per the Canadian Consensus Criteria); one-half of the participants will have co-morbid IBS (per Rome IV criteria). Participants will receive an i3.1 or a placebo and be assessed at baseline, at eight weeks, and at 12 weeks (four weeks post-treatment completion).
Read the detailed description

This single-site comparison study will be performed on 100 participants, 45 to 70 years of age, who meet the Institute of Medicine (Canadian Consensus Criteria) case definition for ME/CFS and who may or may not be diagnosed with the irritable bowel syndrome (IBS), according to the Rome IV criteria. In this study, we will evaluate using the i3.1 probiotic compared to placebo. This is a randomized, placebo-controlled trial with four study arms that will include 25 participants per arm: Individuals with ME/CFS with and without IBS, who will take either the active medication i3.1 or placebo.

03

Conditions studied

  • ME/CFS
  • IBS - Irritable Bowel Syndrome
04

Who can participate

Ages eligible
45 Years to 70 Years
Sexes eligible
All
Accepts healthy volunteers
No

Eligibility criteria

Inclusion Criteria: eligible if all of the following apply:

  • Meets IOM ME/CFS case definition criteria,
  • Co-morbid IBS: meets RomeIV criteria for alternating or diarrhea-predominant IBS as reported during screening (technically diagnosed by a physician),
  • Able to provide consent to study,
  • Patients of must practice effective during the study and be willing to continue contraception for at least six months after the intervention,
  • agrees to participate in online surveys and follow-up visits.

Exclusion Criteria: ineligible if any of the following apply:

  • Probiotics in the past eight weeks,
  • Antibiotics in the past eight weeks,
  • Pregnancy or lactating women,
  • Medical conditions including short bowel syndrome, celiac disease, biliary disease, pancreatitis, inflammatory bowel disease (Crohn's disease, ulcerative colitis), severe cardiovascular, neurological condition, or liver failure,
  • Gastrointestinal surgery within six months of study entry,
  • History of psychiatric disorder, alcohol or illicit drug abuse.
Terms in these criteria, in plain language(2)

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.

Childbearing potential

Able to become pregnant: from the first period until menopause, unless permanently unable to through surgery (removal of the womb, or of both ovaries or both fallopian tubes).

Criteria for people of childbearing potential usually ask for a negative pregnancy test and for contraception during the study and for a time after it.

Contraception

Ways of preventing pregnancy. “Highly effective” methods fail less than 1% of the time a year when used correctly — for example an IUD or an implant.

Criteria usually say which methods count and how long to keep using them after the last dose, sometimes for male participants too. Some studies accept a partner’s vasectomy if it was confirmed successful and that person is the participant’s only sexual partner.

05

Study design

Phase
Phase 2
Primary purpose
Treatment
Allocation
Randomized
Intervention model
Parallel assignment
Masking
Double (Participant, Investigator)
Enrollment
100 participants (estimated)

Study arms

  • Active comparator
    Individuals with ME/CFS with IBS on active medication

    Individuals with ME/CFS with IBS take Floradapt Intensive GI (another name i3.1), one high dose capsule (\>3x10 to the ninth power) once daily for eight weeks.

    Drug: Floradapt Intensive GI

  • Placebo comparator
    Individuals with ME/CFS with IBS on placebo

    Individuals with ME/CFS with IBS take a placebo, one capsule once daily for eight weeks.

    Other: Placebo

  • Active comparator
    Individuals with ME/CFS without IBS on active medication

    Individuals with ME/CFS without IBS take Floradapt Intensive GI (another name i3.1), one high dose capsule (\>3x10 to the ninth power) once daily for eight weeks.

    Drug: Floradapt Intensive GI

  • Placebo comparator
    Individuals with ME/CFS without IBS on placebo

    Individuals with ME/CFS without IBS take a placebo, one capsule once daily for eight weeks.

    Other: Placebo

Interventions

  • DrugFloradapt Intensive GI

    one capsule daily for the eight week intervention

    Also known as: i3.1

  • OtherPlacebo

    one capsule daily for the eight week intervention

06

What researchers measure

Primary outcomes

  1. The Incidence of Intervention-Related Adverse Events [Safety]

    Safety will be assessed by documenting the frequency and severity of adverse events using a standardized form at each visit.

    Time frame: from baseline to the eight week visit

  2. The Measurement of Biomarker Response to an Intervention in the Blood [Efficacy]

    The inflammation biomarkers panel will be measured at baseline and during the eight-week visit. Inflammation biomarkers analyses (such as zonulin, LPS (lipopolysaccharide) endotoxin, LBP (lipopolysaccharide-binding protein)

    Time frame: from baseline to the eight week visit

  3. level of CRP (C-reactive protein)

    CRP (C-reactive protein) will be measured at baseline and the eight-week visit (The Measurement of Biomarker Response)

    Time frame: from baseline to the eight week visit

  4. The pro-inflammatory cytokines level e.g. IL-1, IL-6, and TNF-α

    The Measurement of Biomarker Response : cytokine panel.

    Time frame: from baseline to the eight week visit

  5. The Symptom Severity Measurement [Efficacy]

    The symptom severity will be measured as a change of scores on the DePaul Symptom Questionnaire (DSQ) from baseline to eight-week visit. The severity and frequency are calculated on the Likert scale, where for severity 0 refers to symptoms not present, and 4 is for very severe, and for the frequency: 0 is for none of the time, and 4 is for all of the time. The score range is from 0 to 216. A higher score means a worse outcome (symptoms are present more often with more severity).

    Time frame: from baseline to the eight week visit

Secondary outcomes

  1. The Impact on the Irritable Bowel Syndrome (IBS) Severity

    The impact on the Irritable Bowel Syndrome (IBS) severity will be assessed by response to intervention based on the change in score on the IBS-SSS (Irritable Bowel Syndrome Symptom Severity Scale) questionnaire from a baseline visit to an eight-week visit. Scores response on a 100-point visual analogue scale range from 0 to 500. Subjects can be categorized as mild (75-175), moderate (175-300), or severe (\>300) IBS. A decrease of 50 points is associated with a clinically meaningful improvement.

    Time frame: from baseline to the eight week

  2. The IBS-related Quality of Life Measurement

    The measurement will be provided using the IBS-QOL (the Irritable Bowel Syndrome Quality of Life Measurement) questionnaire every visit from baseline to week eight. Each item is related on the Likert scale, ranging from 1 to 5 (1 as "not at all", 5 as "extremely"). Total score ranges from 34 to 170; higher scores mean a lower life quality. A decrease of 10 points is a clinically meaningful improvement.

    Time frame: from the eight week visit to the 12 week visit

07

Study locations

1 of 1 sites recruiting
08

References and documents

Individual participant data

Plan to share: No — No plan available

No publications or documents are linked to this record.

09

Timeline

Tracking since Sep 25, 2026
ElapsedEstimatedEstimated, not yet reached

Started Dec 2022 (actual). Primary completion is estimated for Feb 2026, 38 months after the start.

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

Registered
Aug 1, 2023
First posted
Jan 18, 2024
StartActual
Dec 20, 2022
Primary completionEst.
Feb 24, 2026
CompletionEst.
Feb 24, 2026
Last update
Mar 4, 2025
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 Mar 4, 2025, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
10

Registry details

Key details

Study ID
NCT06211062
Lead sponsor
Nova Southeastern University
Responsible party
Sponsor
First posted
Jan 18, 2024
Start date
Dec 20, 2022
Primary completion
Feb 24, 2026 (estimated)
Completion
Feb 24, 2026 (estimated)
Last update
Mar 4, 2025

Study contacts

Nancy Klimas, MD
Contact
nklimas@nova.edu
9542622855
Devra Cohen, MPH
Contact
dcohen1@nova.edu
9542621487
Nancy Klimas, MD
principal investigator · Nova Southeastern University, Institute for Neuroimmune Medicine

Oversight

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

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