Microbiome Clinical Trials

105 recruitingLast updated: June 17, 2026

There are 105 actively recruiting microbiome clinical trials across 28 countries. Studies span Not Applicable, Phase 2, Phase 1, Early Phase 1, Phase 4, Phase 3. Top locations include Guangzhou, Guangdong, China, Chicago, Illinois, United States, San Diego, California, United States. Updated daily from ClinicalTrials.gov.


Microbiome Trials at a Glance

105 actively recruiting trials for microbiome are listed on ClinicalTrialsFinder across 6 cities in 28 countries. The largest study group is Not Applicable with 38 trials, with the heaviest enrollment activity in Guangzhou, Chicago, and San Diego. Lead sponsors running microbiome studies include Guangzhou Women and Children's Medical Center, Gulbenkian Institute for Molecular Medicine, and Charite University, Berlin, Germany.

Browse microbiome trials by phase

Treatments under study

About Microbiome Clinical Trials

Looking for clinical trials for Microbiome? There are currently 26 studies actively recruiting participants. Clinical trials offer access to new treatments before they are widely available, and every approved therapy in use today was first tested through a clinical trial.

Below you can browse trials, sign up for alerts when new Microbiome trials open, and view eligibility criteria for each study. Each listing includes the study phase, locations, and enrollment details.

Frequently Asked Questions

Common questions about Microbiome clinical trials

A clinical trial is a carefully designed research study that tests new medical treatments, drugs, devices, or approaches in human volunteers. Every approved medication and treatment available today was proven safe and effective through clinical trials.

All clinical trials are reviewed and approved by Institutional Review Boards (IRBs) — independent committees that evaluate patient safety. Trials follow strict protocols, and your health is monitored closely throughout. You can withdraw at any time.

Not necessarily. Many trials compare the new treatment against the current standard of care, meaning all participants receive active treatment. When placebos are used, they are typically combined with standard treatment, not given alone. The trial description will always specify the design.

Under the Affordable Care Act, most private insurers are required to cover routine patient care costs during a clinical trial. The sponsor typically covers the investigational treatment itself. Medicare also covers routine costs for qualifying trials.

Yes. Participation is completely voluntary. You can withdraw at any time, for any reason, without it affecting your access to standard medical care.

Each trial has specific eligibility criteria — including age, diagnosis, disease stage, prior treatments, and general health. Browse the trials listed above and check their eligibility sections. You can also contact the trial site directly to discuss your situation.

Showing 120 of 105 trials

Recruiting
Not Applicable

Preoperative Fasting and the Gut Microbiome Before Hip Replacement

Surgical wound infectionPostoperative ComplicationsGastrointestinal Microbiome+2 more
Charite University, Berlin, Germany130 enrolled1 locationNCT07651462
Recruiting

Sex-differential Host-microbiome CVD Risk - A Longitudinal Cohort Approach

Immune SystemGut MicrobiomeTransgender+1 more
Charite University, Berlin, Germany200 enrolled1 locationNCT05334888
Recruiting
Not Applicable

Evaluation of Gixam's Efficacy Predicting the Presence of Advanced and Non-advanced Colorectal Neoplasia in a FIT Negative Population

CRC ScreeningMicrobiome
Jubaan Ltd.1,436 enrolled5 locationsNCT07623902
Recruiting
Phase 2

The Bloom Infant Probiotic (BIP) Study

ImmunityInfant, NewbornAntibiotic Treatment+2 more
South Australian Health and Medical Research Institute360 enrolled2 locationsNCT07189390
Recruiting

AGEWISE: Unravelling the Gut-Hormone Axis in Women's Ageing

MenopauseGut MicrobiomeChronic Low-Grade Inflammation+2 more
Gulbenkian Institute for Molecular Medicine300 enrolled1 locationNCT07614542
Recruiting

Westlake Frequent-sampling Cohort 2

Health AdultsStability of Microbiome
Westlake University20 enrolled1 locationNCT07606885
Recruiting

Pulmonary Microbiota Changes and Clinical Outcomes in Neurosurgical ICU Patients With Artificial Airways

Ventilator-Associated Pneumonia (VAP)Microbiome DysbiosisIntensive Care Unit (ICU) Patients
Jian-Xin Zhou220 enrolled3 locationsNCT07129174
Recruiting
Not Applicable

Influence of the Gut Microbiome on Blueberry Polyphenol Metabolites

MetabolomicsMicrobiome Analysis
Colorado State University125 enrolled1 locationNCT07607158
Recruiting
Early Phase 1

Development of a Preparation for Supportive Supplementation of Probiotics in Patients With Reflux

MicrobiomeReflux DiseaseProbiotics Supplement
University Hospital Olomouc50 enrolled1 locationNCT07600008
Recruiting
Not Applicable

Effect of a Food Intervention With a Prebiotic Alone or Combined With B-vitamins on Gut Microbiota Diversity, Inflammation and Mental Health Outcomes in Older Adults (GutFood)

Biomarkers of B-vitamin Status and Gut Microbiome Composition
University of Ulster84 enrolled1 locationNCT07592975
Recruiting

Improving Colorectal Cancer Early Screening in Portugal: Identification of Gut Microbiome Biomarkers in Stool (GUTBIOME-PT)

Colorectal Cancer (CRC)Colorectal Cancer ScreeningMicrobiome
Gulbenkian Institute for Molecular Medicine30,000 enrolled1 locationNCT06741293
Recruiting

CARE-CRC: Microbiome Insights and Correlations for Risk and Outcomes in Colorectal Cancer

Colorectal Cancer (CRC)Early-onset Colorectal CancerMicrobiome
Gulbenkian Institute for Molecular Medicine400 enrolled2 locationsNCT06734156
Recruiting
Not Applicable

Feasibility of a Lifestyle Intervention for Women With Triple-negative Breast Cancer Under Neoadjuvant Immunotherapy

Microbiome
Kliniken Essen-Mitte60 enrolled1 locationNCT07311083
Recruiting
Phase 1Phase 2

COffee and Metabolites Modulating the Gut MicrobiomE in Colorectal caNCER

Colorectal, CancerStenosisFibrosis, Liver+4 more
Massachusetts General Hospital80 enrolled1 locationNCT05692024
Recruiting
Phase 4

Understanding the Efficacy of Dietary Supplement on Fungal Mycobiota in Healthy Volunteers: A Pilot Study

Gut healthGut MicrobiomeDietary Supplement+2 more
Weill Medical College of Cornell University20 enrolled1 locationNCT06433310
Recruiting
Not Applicable

Smart Underwear to Measure Diet-Induced Hydrogen Sulfide Production

Gastrointestinal MicrobiomeHydrogen Sulfide
University of Colorado, Denver25 enrolled1 locationNCT06802276
Recruiting
Phase 2

Effects of Cannabidiol and Tetrahydrocannabinol on Microbiome and Neuroinflammation in HIV

MicrobiomeHIVCannabis+3 more
University of California, San Diego90 enrolled1 locationNCT05514899
Recruiting
Not Applicable

The Effects of an Oral Nutritional Intervention on the Small Intestine Microbiome

MicrobiomeMicrobiome Composition
Société des Produits Nestlé (SPN)25 enrolled1 locationNCT07439718
Recruiting

Monitoring of Antimicrobial Resistance Based on Metagenomics Analyses in Pneumonia Patients

Antimicrobial resistancePneumoniaMicrobiome+1 more
Shanghai General Hospital, China800 enrolled1 locationNCT06566898
Recruiting
Not Applicable

Improving Menstrual and VAginal Health for All

Effects of Menstrual Products on the Vaginal Microbiome
Swiss Tropical & Public Health Institute100 enrolled3 locationsNCT06646185