| Not Yet Recruiting | Assessing Changes in the Gut Microbiome of Non-Gastrointestinal Disordered Subjects Before and After Oral Preb NCT07525739 | Nimble Science Ltd. | Phase 4 |
| Not Yet Recruiting | Evaluating the Effects of Nutritional Interventions on Sleep, the Gut Microbiome, Cognition, and Stress. NCT07369869 | Northumbria University | N/A |
| Not Yet Recruiting | Probiotics, Antibiotics and the Post-Antibiotic Microbiota NCT07425704 | Cultech Ltd | N/A |
| Not Yet Recruiting | Smoothie Program for Achieving and Resilient Kids NCT07195474 | Penn State University | N/A |
| Recruiting | Comparison of the Effects of Oral Hygiene Regimens on Clinical, Immunomodulatory, and Microbial Outcomes and O NCT07501455 | Kenvue Brands LLC | N/A |
| Recruiting | The Effects of an Oral Nutritional Intervention on the Small Intestine Microbiome NCT07439718 | Société des Produits Nestlé (SPN) | N/A |
| Not Yet Recruiting | Feasibility of a Lifestyle Intervention for Women With Triple-negative Breast Cancer Under Neoadjuvant Immunot NCT07311083 | Kliniken Essen-Mitte | N/A |
| Not Yet Recruiting | An Integrated Multi-omics Study on the Molecular Mechanisms of Ureteral Stricture NCT07409870 | First Affiliated Hospital of Chongqing Medical University | — |
| Recruiting | Flourish: Exploring the Early Infant Gut Microbiome NCT07333482 | Seeding Inc | N/A |
| Not Yet Recruiting | Probiotics for Women NCT07364383 | Cultech Ltd | N/A |
| Recruiting | Observational Study of Gut Microbiota in Abemaciclib-Treated Patients With and Without Diarrhea NCT07264998 | Hubei Cancer Hospital | — |
| Not Yet Recruiting | CARE-CRC: Microbiome Insights and Correlations for Risk and Outcomes in Colorectal Cancer NCT06734156 | Gulbenkian Institute for Molecular Medicine | — |
| Recruiting | The Role of Microbiota in Pancreatic Cancer and Precursor Lesions NCT07250100 | Herlev Hospital | — |
| Recruiting | Dynamics of Dysbiosis in the Skin and Gut Microbiome of Burn Patients NCT07209007 | Cho Yoon soo | — |
| Recruiting | Oral Changes With Caloric and no Caloric Sweeteners NCT05852145 | Hospital Infantil de Mexico Federico Gomez | Phase 1 / Phase 2 |
| Completed | Effect of Vaginal Estrogen on Alterations in the Urine Microbiome of Menopausal Women With Overactive Bladder NCT06780163 | Mahidol University | Phase 4 |
| Enrolling By Invitation | Enabling Microbiomics- Driven Personalized Nutrition NCT06657001 | Mayo Clinic | — |
| Completed | Fermented Vegetables and Gut Microbiome Pilot Study NCT06883994 | USDA, Western Human Nutrition Research Center | N/A |
| Not Yet Recruiting | Supplementation of Inulin + L. Acidophilus in Elders with T2DM NCT06830824 | Anahuac University | N/A |
| Recruiting | STI Prophylaxis and Emergence of Antimicrobial Resistance NCT06778083 | University College, London | — |
| Not Yet Recruiting | Assessing the Safety of an IGY Supplement on the Gut Microbiome NCT06702280 | Nimble Science Ltd. | Phase 1 |
| Recruiting | The Role of Brain-Bone Marrow-Gut Interaction Following Major Trauma NCT06606119 | University of Florida | — |
| Completed | Implementing Good Nutrition to Improve, Transform, and Enhance (IGNITE) Firefighters' Health NCT06567561 | Stanford University | N/A |
| Recruiting | Monitoring of Antimicrobial Resistance Based on Metagenomics Analyses in Pneumonia Patients NCT06566898 | Shanghai General Hospital, China | — |
| Recruiting | Bile Acids and Microbiome in Early Colorectal Carcinogenesis NCT06502704 | Vilnius University | — |
| Recruiting | Microecology and Immunity in Patients With Anti-MDA5 Antibody Positive Dermatomyositis and Interstitial Lung D NCT06203249 | Chinese PLA General Hospital | — |
| Recruiting | Improving Colorectal Cancer Early Screening in Portugal: Identification of Gut Microbiome Biomarkers in Stool NCT06741293 | Gulbenkian Institute for Molecular Medicine | — |
| Recruiting | Effects of Cannabidiol and Tetrahydrocannabinol on Microbiome and Neuroinflammation in HIV NCT05514899 | University of California, San Diego | Phase 2 |
| Completed | Precision Nutrition Recommendations Generated by Metataxonomic Microbiome Testing Improve Food Group Choices a NCT07492485 | Astrolab bio | N/A |
| Active Not Recruiting | Infant Restore: Efficacy of Microbiome Analysis and Education NCT06424691 | Seeding Inc | N/A |
| Recruiting | Synbiotics and Fecal Microbiota Transplantation to Treat Non-Alcoholic Steatohepatitis NCT05821010 | Academisch Medisch Centrum - Universiteit van Amsterdam (AMC-UvA) | Phase 2 |
| Completed | Inflammation in HIV/AIDS-InflammAIDS NCT07367867 | Universidad de Magallanes | — |
| Completed | Impact of Symbiofilm On Nasal Microbiota NCT05015530 | Lallemand Pharma AG | — |
| Unknown | Development of Novel Fecal Microbial Biomarkers for Inflammatory Bowel Disease NCT05598489 | Chinese University of Hong Kong | — |
| Unknown | Elucidating the Microbiome in Patients With Recurrent Pregnancy Loss NCT05612620 | Assuta Ashdod Hospital | — |
| Recruiting | MOdification Of THe Early-Life Respiratory Microbiome Through Vaginal SEEDing NCT05505110 | Vanderbilt University Medical Center | EARLY_Phase 1 |
| Recruiting | A Multicenter Cohort Study on Maternal and Infant Microecology and New Targets for Pre-eclampsia Screening in NCT05445544 | Zhujiang Hospital | — |
| Unknown | Frozen Embryo Transfer Pregnancy Outcomes Prediction by Microbiome and Transcriptome NCT05545631 | Shengjing Hospital | — |
| Unknown | Frozen Embryo Transfer Pregnancy Outcomes Prediction by Microbiome NCT05521295 | Shengjing Hospital | — |
| Recruiting | Microbiome and Metabolome Profiles in Couples Undergoing IVF and Reproductive Outcomes NCT07532629 | Karolinska Institutet | — |
| Unknown | Microbiome, Anxiety and Cognitive Orientation Study NCT05388630 | Endominance | — |
| Completed | Comparison Study of Manapol and DaltonMax on Immune Function, Microbiome, and Related Variables in Men and Wom NCT05510050 | University of Memphis | N/A |
| Recruiting | Microbial Restoration in Inflammatory Bowel Diseases NCT04970446 | St Vincent's Hospital Melbourne | Phase 1 / Phase 2 |
| Completed | Twins Nutrition Study (TwiNS): Vegan vs. Omnivore NCT05297825 | Stanford University | N/A |
| Recruiting | Augmented Response of Volatile Biomarkers in Assessment of Oesophagogastric Cancer (AROMA 1 / BIORESOURCE) NCT05412758 | Imperial College London | N/A |
| Unknown | Effects of IAP-EOGBSD on Offspring's Gut Microbiome and Immunity. NCT05738460 | Zhujiang Hospital | — |
| Recruiting | Role of Microbiome in BCG Responsiveness Prediction NCT05204199 | Cédric Poyet | — |
| Active Not Recruiting | Alcoholic Liver Disease and the Gut Microbiome NCT05007470 | University of California, Los Angeles | N/A |
| Active Not Recruiting | Maternal & Offspring Microbiome Study NCT05123612 | Stanford University | N/A |
| Completed | ROTA-biotic: Measuring the Impact of Rotavirus Vaccines on Paediatric Antibiotic Usage NCT06882070 | Academisch Medisch Centrum - Universiteit van Amsterdam (AMC-UvA) | — |
| Unknown | The Characteristic of Airway Microbiome Profiling of COPD-bronchiectasis Overlap Patients and Its Association NCT04865861 | Guangzhou Medical University | — |
| Unknown | Gut Microbiota, the Potential Key to Modulating Humoral Immunogenicity of New Platform COVID-19 Vaccines NCT05150834 | Korea University Guro Hospital | — |
| Unknown | Microbiome and Exacerbations in Neutrophilic Asthma NCT04260282 | Fundació Institut de Recerca de l'Hospital de la Santa Creu i Sant Pau | — |
| Completed | Effects of the Use of Probiotics on the Intestinal Microbiota of Patients With Gastric Cancer NCT06250075 | Universidade Federal do Amazonas | N/A |
| Completed | Westlake Sailing Cohort NCT04611945 | Westlake University | — |
| Completed | Investigating the Detection of Bovine and Soy Proteins in Human Milk NCT04851340 | University of Idaho | N/A |
| Completed | Fecal and Oral Microbiota Between Pancreatic Cancer and Benign/Low-grade Malignant Tumor Patients NCT06659237 | Peking Union Medical College Hospital | — |
| Active Not Recruiting | Alterations of the Microbiome During Critical Illness With Short and Long Term Clinical Outcomes NCT04552834 | University of Chicago | — |
| Unknown | The Analysis of Association of Retinopathy of Prematurity, Gut Microbiome Profile, and Systemic Inflammation NCT05144282 | Chang Gung Memorial Hospital | — |
| Unknown | Microbiome and Papillary Thyroid Microcarcinoma NCT04376203 | University of Ioannina | — |
| Completed | Effect of Lactobacillus on the Microbiome of Household Contacts Exposed to COVID-19 NCT04399252 | Duke University | N/A |
| Unknown | Microbiome Analysis in Gastric Intestinal Metaplasia and in Gastric Cancer and Subtypes Correlation NCT04365946 | University Hospital, Ioannina | — |
| Withdrawn | A Non-Interventional Pilot Study to Explore the Role of Gut Flora in Clostridoides Difficile Infection NCT04100603 | ProgenaBiome | — |
| Withdrawn | Dietary Fibers Effect on the Gut Microbiota Composition NCT04114513 | Atlas Biomed | N/A |
| Completed | Mapping the Health Status of the Population of French Polynesia: the MATAEA Project NCT06133400 | Institut Louis Malardé | N/A |
| Unknown | Study of the Correlation of Tumor Tissue Microbiome to the Pathogenesis of Lung Cancer NCT04260295 | Huashan Hospital | — |
| Withdrawn | A Non-Interventional Pilot Study to Explore the Skin Microbes in Skin Cancer NCT04099446 | ProgenaBiome | — |
| Unknown | BioForte Technology for in Silico Identification of Candidates for a New Microbiome-based Therapeutics and Dia NCT04136470 | Ardigen | — |
| Completed | The RAMP Study - Rejuvenation of the Aging Microbiota With Prebiotics NCT03690999 | Stanford University | N/A |
| Completed | SWAP-MEAT: Study With Appetizing Plant Food - Meat Eating Alternatives Trial NCT03718988 | Stanford University | N/A |
| Unknown | Effect of Liraglutide on Microbiome in Obesity NCT04046822 | Federico II University | Phase 4 |
| Unknown | Prospective Cohort Study of Molecular Mechanism of Lower Respiratory Tract Microbes in Patients With AECOPD NCT04259736 | Huashan Hospital | — |
| Completed | Dysbiosis Impact on Lung Disease in HIV NCT04155684 | University of Pittsburgh | — |
| Unknown | One Year Home Monitoring and Treatment of IBS Patients NCT03586622 | Nordsjaellands Hospital | N/A |
| Completed | Effect of Strawberry Consumption on the Microbiome NCT04217122 | University of California, Los Angeles | N/A |
| Completed | Examining the Effects of Juice Fasting NCT03647449 | Northwestern University | N/A |
| Completed | Gut Microbiota in Acute Stroke Patients NCT03934021 | Chinese University of Hong Kong | — |
| Completed | Modification of Gut Microbiota in the Treatment of Insulin Resistance: a Personalized Approach NCT03710850 | Charles University, Czech Republic | N/A |
| Completed | Investigation of Microbiome-based Prognostical Biomarkers in Patients With Morbid Obesity and Bariatric Surger NCT03391401 | St. Franziskus Hospital | — |
| Completed | The Effect of Oats Containing 1.4g Beta Glucan on Fecal Bacterial Population(s) and Plasma Cholesterol in Heal NCT03450395 | PepsiCo Global R&D | N/A |
| Terminated | The Influence of Gonadal Hormone Suppression on Adipocyte Lineage and the Microbiome NCT03396978 | University of Colorado, Denver | N/A |
| Completed | Evaluation of Two Regimens, With Healthy Male and Female Babies, Ages 3-6 Months Old, Using Various Assessment NCT03457857 | Johnson & Johnson Consumer Inc. (J&JCI) | N/A |
| Unknown | Polish Microbiome Map NCT04169867 | Ardigen | — |
| Completed | Cosmetic Effects of Topical Acetyl Zingerone NCT03530787 | University of California, Davis | N/A |
| Completed | The Influence of Personal Care Products on the Skin Microbiome NCT03819179 | University of California, Davis | N/A |
| Active Not Recruiting | The Premature Gut Microbiome and the Influence on Neonatal Immunity, Brain Development and White Matter Injury NCT03213275 | Medical University of Vienna | — |
| Completed | Probiotic Supplement and Microbiome, Immune System and Metabolic Syndrome NCT03201068 | Stanford University | N/A |
| Completed | Studying on the Difference Between Two Kinds of Osteomyelitis NCT04240964 | Nanfang Hospital, Southern Medical University | — |
| Unknown | Examining the Change in Microbiome Diversity and Urine Metabolites After Lignite Extract Use NCT03026621 | Seraphic Group Inc | N/A |
| Completed | Fermented and Fiber-rich Food (FeFiFo) Study NCT03275662 | Stanford University | N/A |
| Terminated | Study of Antibiotic-induced Vaginal Yeast Infections in Healthy Women NCT01915251 | National Institute of Allergy and Infectious Diseases (NIAID) | — |