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Showing 1–24 of 261 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: Roux-en-Y-Gastric Bypass Clear all
Completed Phase 1 Interventional

RYGB and the Gastric Adipose Axis

NCT01474785
View directory record Official record
Conditions
Obesity
Interventions
human ghrelin, very low calorie diet, Hyperinsulinemic/Euglycemic Clamp
Drug · Other · Procedure
Lead sponsor
Vanderbilt University
Other
Eligibility
18 Years to 65 Years
Enrollment
49 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2015
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated May 20, 2018 · Synced Sep 29, 2026, 4:27 AM EDT
Not listed Not applicable Interventional Accepts healthy volunteers

Alcohol Related Impairment and Reinforcement: Pre to Post Roux en Y Gastric Bypass Surgery

NCT02370732
View directory record Official record
Conditions
Bariatric Surgery Candidate
Interventions
Alcohol
Other
Lead sponsor
Neuropsychiatric Research Institute, Fargo, North Dakota
Other
Eligibility
21 Years to 65 Years
Enrollment
60 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2019
U.S. locations
1
States / cities
Fargo, North Dakota
Source: ClinicalTrials.gov public record
Updated Sep 27, 2016 · Synced Sep 29, 2026, 4:27 AM EDT
Terminated Phase 4 Interventional Results available

Treatment of GLP-1 for Diabetic Bariatric Patients

NCT04624672
View directory record Official record
Conditions
Diabetes Mellitus, Type 2
Interventions
Semaglutide (1 Mg Dose), Placebo
Drug
Lead sponsor
Geisinger Clinic
Other
Eligibility
18 Years to 75 Years
Enrollment
3 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2022
U.S. locations
1
States / cities
Danville, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Nov 13, 2023 · Synced Sep 29, 2026, 4:27 AM EDT
Completed No phase listed Observational

Small Bowel Length and Bariatric Surgery Outcomes

NCT02872493
View directory record Official record
Conditions
Malnutrition, Obesity, Weight Loss, Micronutrient Deficiency
Interventions
Small bowel length measurement
Procedure
Lead sponsor
Vanderbilt University Medical Center
Other
Eligibility
18 Years and older
Enrollment
470 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2025
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Jul 7, 2025 · Synced Sep 29, 2026, 4:27 AM EDT
Completed Phase 3 Interventional

Impact of Gastric Bypass Surgery on Risk of CVD in Type 2 Diabetes Mellitus

NCT00444392
View directory record Official record
Conditions
Obese Patients, Type 2 Diabetes Mellitus
Interventions
Calorie controlled diabetic diet for the control patients
Behavioral
Lead sponsor
Vanderbilt University
Other
Eligibility
18 Years to 60 Years
Enrollment
9 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2009
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Nov 20, 2016 · Synced Sep 29, 2026, 4:27 AM EDT
Completed Not applicable Interventional Results available

The Effect of Pre-Operative Transversus Abdominis Plane (TAP) Block in the Post Operative Opioid Consumption in Morbid Obese Patients Undergoing Laparoscopic Gastric Bypass Surgery: A Prospective,Randomized, Blinded Study

NCT01075087
View directory record Official record
Conditions
Pain, Obesity, Surgery
Interventions
Placebo, (study group) will receive a bilateral TAP block using 20 cc of 0.5% ropivacaine on each side.
Drug
Lead sponsor
Northwestern University
Other
Eligibility
18 Years to 65 Years
Enrollment
19 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2012
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Jun 25, 2014 · Synced Sep 29, 2026, 4:27 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

Changes in Body Composition Following Bariatric Surgery

NCT02148068
View directory record Official record
Conditions
Obesity
Interventions
Bariatric Surgery
Procedure
Lead sponsor
Peter Nau
Other
Eligibility
18 Years to 65 Years
Enrollment
136 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014 – 2018
U.S. locations
1
States / cities
Iowa City, Iowa
Source: ClinicalTrials.gov public record
Updated Nov 19, 2018 · Synced Sep 29, 2026, 4:27 AM EDT
Completed Not applicable Interventional

Metabolic Surgery Versus Medical Management for Resolution of Type II Diabetes

NCT01044602
View directory record Official record
Conditions
Obesity, Type 2 Diabetes Mellitus
Interventions
Laboratory evaluations, sleep study, Best Medical Management, Roux-en-Y gastric bypass surgery
Other · Procedure
Lead sponsor
David Bradley MD
Other
Eligibility
25 Years to 70 Years
Enrollment
120 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2014
U.S. locations
1
States / cities
Columbus, Ohio
Source: ClinicalTrials.gov public record
Updated Apr 20, 2015 · Synced Sep 29, 2026, 4:27 AM EDT
Completed Not applicable Interventional Results available

Laparoscopic Gastric Bypass vs LAP-BAND for Treatment of Morbid Obesity

NCT00247377
View directory record Official record
Conditions
Morbid Obesity
Interventions
Gastric bypass surgery, Lap-Band
Procedure
Lead sponsor
University of California, Irvine
Other
Eligibility
18 Years to 60 Years
Enrollment
197 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2002 – 2009
U.S. locations
1
States / cities
Orange, California
Source: ClinicalTrials.gov public record
Updated Apr 23, 2023 · Synced Sep 29, 2026, 4:27 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Nutritional Effect of an Amino Acid Mixture on Lean Body Mass (LBM) in Post-bariatric Surgery Patients

NCT00473356
View directory record Official record
Conditions
Obesity, Post-gastric Bypass
Interventions
receive amino acid supplement
Dietary Supplement
Lead sponsor
University of Alabama at Birmingham
Other
Eligibility
18 Years and older
Enrollment
30 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2007 – 2010
U.S. locations
1
States / cities
Birmingham, Alabama
Source: ClinicalTrials.gov public record
Updated Nov 18, 2013 · Synced Sep 29, 2026, 4:27 AM EDT
Active, not recruiting No phase listed Observational

Biological Sample Repository for Gastrointestinal Disorders

NCT05874726
View directory record Official record
Conditions
Obesity, Obesity, Morbid, Obesity, Primary, Gastro-Intestinal Disorder, Overweight and Obesity, Overweight, Overweight or Obesity, Diabetes Type 2, Diabetes Mellitus, Diabetes Mellitus, Type 2, Hypertension, Hyperlipidemias, Sleep Apnea, GERD, Gastroesophageal Reflux, Musculoskeletal Pain Disorder, Cancer
Interventions
Blood Collection, Urine Collection, Tissue Sample Collection
Diagnostic Test
Lead sponsor
Pichamol Jirapinyo, MD, MPH
Other
Eligibility
18 Years and older
Enrollment
500 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2029
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Dec 1, 2025 · Synced Sep 29, 2026, 4:27 AM EDT
Completed Phase 4 Interventional Results available

Pilot Study for Zoledronic Acid to Prevent Bone Loss After Bariatric Surgery

NCT03424239
View directory record Official record
Conditions
Bariatric Surgery Candidate
Interventions
Zoledronic Acid, Calcium citrate + vitamin D, Vitamin D3
Drug · Dietary Supplement
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
25 Years to 100 Years
Enrollment
6 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2020
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Apr 28, 2021 · Synced Sep 29, 2026, 4:27 AM EDT
Completed No phase listed Observational

Bone Loss After Laparoscopic Roux-en-Y Gastric Bypass

NCT00975013
View directory record Official record
Conditions
Bone Loss, Bone Density, Gastric Bypass, Bariatric Surgery
Interventions
Not listed
Lead sponsor
Gundersen Lutheran Medical Foundation
Other
Eligibility
30 Years to 65 Years · Female only
Enrollment
40 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2009
U.S. locations
1
States / cities
La Crosse, Wisconsin
Source: ClinicalTrials.gov public record
Updated Sep 6, 2015 · Synced Sep 29, 2026, 4:27 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

fMRI and Appetite-Related Hormones Pre and Post Obesity Surgery

NCT01583725
View directory record Official record
Conditions
Obesity
Interventions
Liquid meal responses, fMRI responses to food-cues
Procedure · Behavioral
Lead sponsor
New York Obesity and Nutrition Research Center
Other
Eligibility
18 Years to 65 Years
Enrollment
120 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2015
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Aug 26, 2024 · Synced Sep 29, 2026, 4:27 AM EDT
Completed Phase 2Phase 3 Interventional Results available

Study on the Use of Low Dose Ketamine After Gastric Bypass and Gastrectomy

NCT02452060
View directory record Official record
Conditions
Pain, Postoperative Depression
Interventions
Ketamine, Placebo Comparator
Drug · Other
Lead sponsor
NYU Langone Health
Other
Eligibility
18 Years to 65 Years
Enrollment
90 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2017
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Mar 15, 2020 · Synced Sep 29, 2026, 4:27 AM EDT
Completed Not applicable Interventional

Impact of GBS on CVD in Type 2 Diabetes Mellitus

NCT00787670
View directory record Official record
Conditions
Obesity, Type 2 Diabetes Mellitus
Interventions
Diabetes Support and Education, gastric bypass surgery, Tissue Control Group
Other · Procedure
Lead sponsor
Duke University
Other
Eligibility
18 Years to 60 Years
Enrollment
84 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2011
U.S. locations
1
States / cities
Durham, North Carolina
Source: ClinicalTrials.gov public record
Updated Feb 4, 2013 · Synced Sep 29, 2026, 4:27 AM EDT
Completed Phase 2 Interventional

PRebiotic to IMprovE Calcium Absorption

NCT03272542
View directory record Official record
Conditions
Obesity
Interventions
Prebiotic: soluble corn fiber, Placebo: maltodextrin
Dietary Supplement
Lead sponsor
San Francisco Veterans Affairs Medical Center
Federal
Eligibility
18 Years to 75 Years · Female only
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2020
U.S. locations
1
States / cities
San Francisco, California
Source: ClinicalTrials.gov public record
Updated Oct 21, 2020 · Synced Sep 29, 2026, 4:27 AM EDT
Recruiting No phase listed Observational Accepts healthy volunteers

Investigating the Link Between Type 2 Immunity and NAFLD in Human Obesity

NCT04232566
View directory record Official record
Conditions
Obesity, Morbid, NASH - Nonalcoholic Steatohepatitis, Chronic Inflammation
Interventions
Bariatric surgery
Procedure
Lead sponsor
Mayo Clinic
Other
Eligibility
30 Years to 70 Years
Enrollment
60 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2027
U.S. locations
1
States / cities
Scottsdale, Arizona
Source: ClinicalTrials.gov public record
Updated Jan 27, 2026 · Synced Sep 29, 2026, 4:27 AM EDT
Completed Phase 1Phase 2 Interventional Results available

Use of Oral Probiotics to Reduce Urinary Oxalate Excretion

NCT00587041
View directory record Official record
Conditions
Nephrolithiasis, Hyperoxaluria, Crohn's Disease
Interventions
Oxadrop, Agri-King Synbiotic (AKSB), Placebo
Dietary Supplement · Other
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years and older
Enrollment
40 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2009
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated May 30, 2012 · Synced Sep 29, 2026, 4:27 AM EDT
Active, not recruiting Phase 2Phase 3 Interventional

GLP-1 Receptor Agonists Post-Bariatric Surgery (GRABS) Pilot Trial

NCT06162715
View directory record Official record
Conditions
Severe Obesity, Obesity, BMI Greater Than 30
Interventions
Tirzepatide, Standard of Care post-gastric bypass
Drug · Other
Lead sponsor
Vanderbilt University Medical Center
Other
Eligibility
25 Years to 65 Years
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2027
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Aug 3, 2026 · Synced Sep 29, 2026, 4:27 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

Skeletal Health in Bariatric Surgery Patients

NCT03331536
View directory record Official record
Conditions
Bariatric Surgery, Osteoporosis, Fractures, Bone, Roux En-Y Gastric Bypass, Sleeve Gastrectomy, Menopause, Premenopause
Interventions
Roux en Y Gastric Bypass Pre-menopausal, Roux en Y Gastric Bypass Post-menopausal, Sleeve Gastrectomy Pre-menopausal, Sleeve Gastrectomy Post-menopausal
Procedure
Lead sponsor
University of Alabama at Birmingham
Other
Eligibility
19 Years and older · Female only
Enrollment
27 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2020
U.S. locations
1
States / cities
Birmingham, Alabama
Source: ClinicalTrials.gov public record
Updated Aug 17, 2020 · Synced Sep 29, 2026, 4:27 AM EDT
Completed Not applicable Interventional Results available

Study of the Effect of the Drug Gabapentin on Postoperative Pain and Incidence of Postoperative Nausea and Vomiting

NCT00886236
View directory record Official record
Conditions
Obesity, Morbid, Postoperative Pain, Postoperative Nausea and Vomiting
Interventions
Gabapentin, Placebo
Drug
Lead sponsor
Medical University of South Carolina
Other
Eligibility
18 Years to 80 Years
Enrollment
62 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2011
U.S. locations
1
States / cities
Charleston, South Carolina
Source: ClinicalTrials.gov public record
Updated Sep 19, 2018 · Synced Sep 29, 2026, 4:27 AM EDT
Active, not recruiting No phase listed Observational

Transoral Fundoplication Prior to Sleeve Gastrectomy Versus RNY Gastric Bypass on GERD Symptoms in Bariatric Patients

NCT05365087
View directory record Official record
Conditions
Gastroesophageal Reflux Disease
Interventions
Transoral Fundoplication and Sleeve Gastrectomy, Gastric Bypass
Procedure
Lead sponsor
Lexington Health Incorporated
Other
Eligibility
18 Years and older
Enrollment
180 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2032
U.S. locations
1
States / cities
West Columbia, South Carolina
Source: ClinicalTrials.gov public record
Updated May 7, 2025 · Synced Sep 29, 2026, 4:27 AM EDT
Active, not recruiting No phase listed Observational

Comparison of Body Composition Changes With Weight Loss Interventions

NCT07115069
View directory record Official record
Conditions
Obesity
Interventions
GLP-1 receptor agonist, Gastric Bypass Surgery (laparoscopic), Gastric Bypass Surgery (robotic)
Drug · Procedure
Lead sponsor
Vanderbilt University Medical Center
Other
Eligibility
21 Years to 65 Years
Enrollment
60 participants
Timeline
2025 – 2027
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Jul 13, 2026 · Synced Sep 29, 2026, 4:27 AM EDT