A Study to Evaluate the Impact of Lactobacillus Rhamnosus GG on Proton Pump Inhibitor-Induced Gut Dysbiosis

Last updated: January 6, 2026
Sponsor: Mayo Clinic
Overall Status: Active - Recruiting

Phase

N/A

Condition

N/A

Treatment

Omeprazole

Lactobacillus rhamnosus GG

Placebo

Clinical Study ID

NCT05517928
21-007621
  • Ages > 18
  • All Genders
  • Accepts Healthy Volunteers

Study Summary

The purpose of this study is to investigate the impact of the probiotic Lactobacillus rhamnosus (LGG) on proton pump inhibitor (PPI)-induced changes to the microbes that live in the gastrointestinal tract and are passed out in the stool. PPI medicines reduce stomach acid and are commonly used to treat acid reflux disease.

Eligibility Criteria

Inclusion

Inclusion Criteria:

  • Individuals on an unrestricted regular diet with no dietary restrictions (vegan, lowFODMAP, gluten free, dairy-free etc) or other fad diets (e.g., keto, intermittentfasting, etc.).

  • Healthy subjects will be screened for current or chronic GI symptoms using a 16-itemquestionnaire.

  • Only those with an absence of symptoms will eligible to participate.

Exclusion

Exclusion Criteria:

  • For healthy volunteers, will include prior surgery altering the esophagus, stomach,and intestine (except appendectomy).

  • Chronic daily use of medications affecting GI secretion or motor function.

  • The presence of any GI-motility affecting systemic diseases or untreated psychiatricdisease.

  • Pregnancy.

Study Design

Total Participants: 30
Treatment Group(s): 3
Primary Treatment: Omeprazole
Phase:
Study Start date:
March 03, 2023
Estimated Completion Date:
December 31, 2026

Connect with a study center

  • Mayo Clinic Arizona

    Scottsdale, Arizona 85259
    United States

    Site Not Available

  • Mayo Clinic Arizona

    Scottsdale 5313457, Arizona 5551752 85259
    United States

    Active - Recruiting

Map preview placeholder

Not the study for you?

Let us help you find the best match. Sign up as a volunteer and receive email notifications when clinical trials are posted in the medical category of interest to you.