Clinical trial Recruiting at 1 site Phase 2 Interventional Ages 45 to 70

Using probiotics to treat Myalgic Encephalomyelitis/Chronic Fatigue Syndrome

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

Run by Nova Southeastern University · NCT06211062 · Data updated 2026-11-12

This study is testing if a new probiotic can help people aged 45 to 70 with Myalgic Encephalomyelitis/Chronic Fatigue Syndrome and possibly irritable bowel syndrome feel better.

More IBS (Irritable Bowel Syndrome) trials

Quick facts

PhasePhase 2
Study typeInterventional
Ages45 Years to 70 Years
SexAll
Enrollment100 (estimated)
SponsorNova Southeastern University
Academic / other
Locations1 site (Fort Lauderdale, Florida)
StatusRecruiting
StartedDecember 20, 2022
Main results expectedFebruary 24, 2026
Study endsFebruary 24, 2026
Registry record updatedMarch 4, 2025
Trial IDNCT06211062 on ClinicalTrials.gov

Is this trial a fit for you?

Likely a good fit

Ideal candidates are adults aged 45 to 70 who meet the ME/CFS criteria and may have IBS.

Probably not a fit

Patients with recent use of probiotics or antibiotics, or those with certain gastrointestinal or severe medical conditions, may not benefit from this study.

A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.

What this trial studies

This clinical study evaluates the effectiveness of the i3.1 probiotic in participants aged 45 to 70 who meet the criteria for Myalgic Encephalomyelitis/Chronic Fatigue Syndrome (ME/CFS) and may also have irritable bowel syndrome (IBS). The study is a randomized, placebo-controlled trial involving 100 participants, with half having co-morbid IBS. Participants will receive either the i3.1 probiotic or a placebo and will be assessed at baseline, eight weeks, and twelve weeks post-treatment to measure gastrointestinal inflammation and IBS severity.

Why it matters

Potential benefit: If successful, this study could provide a new therapeutic option for managing symptoms of ME/CFS and IBS.

How similar studies have gone: While the use of probiotics in gastrointestinal conditions has been explored, this specific application in ME/CFS is relatively novel and has not been extensively tested.

Who can join: the full rules

Show full inclusion / exclusion 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 childbearing potential must practice effective contraception 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.

Where it's running

  • Institute for Neuroimmune Medicine
    Fort Lauderdale, Florida, United States
    Recruiting

Study contacts

  • Principal investigator: Nancy Klimas, MD — Nova Southeastern University, Institute for Neuroimmune Medicine
  • Study coordinator: Nancy Klimas, MD
  • Email: nklimas@nova.edu
  • Phone: 9542622855

Similar studies

Other studies for the same condition or treatment. Recruiting studies are listed first.

How to take part

  1. Review the eligibility criteria above with your treating physician.
  2. Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
  3. Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.
Last reviewed 2026-11-14 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.