Clinical trials
Bariatric Surgery clinical trials
Below are recruiting bariatric surgery clinical trials, each written for real people, not researchers. We’re tracking 238 recruiting studies, each written for real people, not researchers, below.
Recruiting studies
- NCT06829381Recruiting
Personalized one-anastomosis gastric bypass trial
This trial studies a personalized version of a common weight-loss surgery called One Anastomosis Gastric Bypass (OAGB). It aims to see if tailoring the surgery to each person improves results and safety.
Tel AvivAges 18 years+ - NCT06783751Recruiting
New surgical method to reduce acid reflux after weight loss surgery
This trial tests a modified version of sleeve gastrectomy that aims to reduce the risk of acid reflux (GERD) after surgery. It is for people aged 18–65 with a BMI between 35 and 55 who already have some degree of GERD and are planning to have weight loss surgery.
Orange, CaliforniaAges 18–65 - NCT05356000Recruiting
Testing how oxalate is absorbed to help prevent kidney stones
This study looks at how your body absorbs oxalate, a natural chemical that can contribute to calcium kidney stones. If you’ve had calcium stones—especially with high urine oxalate—it may help researchers find ways to reduce future stone risk.
Chicago, IllinoisAges 18–70 - NCT06289413Recruiting
Nervous system changes after weight-loss surgery
This study looks at how bariatric surgery affects the part of your nervous system that controls things like heart rate and blood pressure (autonomic function). It may help patients preparing for or recovering from weight-loss surgery.
Overland Park, KansasAges 18–85 - NCT06511310Recruiting
Exercise, brain health, and weight maintenance after weight loss surgery
This study looks at how exercise affects brain activity and helps people keep weight off after they have regained some weight following bariatric surgery. You may join if you had weight loss surgery, lost weight, and then regained more than 10% of that lost weight within the last 1 to 5 years.
Boston, MassachusettsAges 18–70 - NCT06515691Recruiting
Nerve block for pain after weight loss surgery
This study tests a nerve block (an injection near the nerves) to see if it helps reduce pain after laparoscopic sleeve gastrectomy. The block is called a modified thoracoabdominal nerve plane block, and it may lead to better pain control and recovery.
Istanbul, BagcilarAges 18–65 - NCT01803451RecruitingEarly Phase 1
Tested after gastric bypass for low blood sugar
This early study looks at a gut hormone–based treatment (GLP-1) and how it affects blood sugar and digestion after gastric bypass. It may help people who are having repeated low blood sugar episodes after surgery.
San Antonio, TexasAges 18–65 - NCT06484621Recruiting
Preventing weight regain after weight loss surgery with exercise
This study looks at whether increased physical activity can help prevent weight regain after weight loss surgery. It is for people who had gastric bypass or sleeve gastrectomy in the last 6–20 months and have regained less than 10% of their lost weight.
Hartford, ConnecticutAges 18–64 - NCT04893954Recruiting
Study of spine changes after weight loss from bariatric surgery
This study looks at how rapid weight loss after bariatric surgery may affect your spine over the following year or more. It may help doctors better predict who gets spine-related problems or improvements after surgery.
ParisAges 18 years+ - NCT06425016Recruiting
Robot-assisted vs. traditional sleeve gastrectomy
This study compares two types of weight-loss surgery: one done with the help of a robot and the other done by hand (laparoscopic). Both are types of sleeve gastrectomy, where the stomach is reduced in size. If you qualify for sleeve gastrectomy, this trial may help doctors learn which method works better.
Cleveland, OhioAges 18–70 - NCT06345560RecruitingPhase 1/Phase 2
Birth control pill study before and after weight-loss surgery
This study looks at how a progestin-only birth control pill works in obese women before and after bariatric surgery. It may help find the best way to prevent pregnancy during this time.
BangkokAges 18–45 - NCT06345586Recruiting
Birth control pill study for women having weight-loss surgery
This study tests how a birth control pill with only drospirenone (a type of progestin) affects cervical mucus in women who are about to have weight-loss surgery. It will help understand if this pill is a good option for preventing pregnancy after surgery.
BangkokAges 18–45 - NCT06278285Recruiting
GLP-1 drug effect on fat tissue before bariatric surgery
This study looks at how taking a GLP-1 medicine (like Ozempic or Wegovy) affects your fat tissue before bariatric surgery. It compares people who have taken a GLP-1 for at least 3 months to those who never have.
Nice, Alpes-maritimesAges 18 years+ - NCT06257771Recruiting
Alcohol and gastric sleeve surgery study
This study looks at how alcohol affects people who have had gastric sleeve surgery (a type of weight loss surgery) compared to those who haven't. It may help explain if surgery changes how your body processes alcohol.
Urbana, IllinoisAges 21–64 - NCT05777928Recruiting
Tests satiety changes after bariatric surgery revision
This study looks at how feelings of fullness (satiety) change in people getting bariatric surgery—either a sleeve gastrectomy or a revision procedure. It may help improve how well weight-loss stays on track after surgery.
MilanAges 18–65 - NCT05975580RecruitingPhase 4
Medication plus lifestyle counseling for weight regain after bariatric surgery
This study looks at whether adding medication to lifestyle counseling can help people who have regained weight after sleeve gastrectomy or gastric bypass. It focuses on improving weight control and related health after surgery.
Orange, CaliforniaAges 18–70 - NCT05650307Recruiting
Heart and metabolic scan study of weight and rehabilitation
This study uses detailed heart scans and information about metabolism (how your body uses energy) to understand how metabolic treatments and heart rehabilitation may affect your health. You may qualify either as someone undergoing bariatric (weight-loss) care or as part of a heart rehabilitation group—or as a healthy comparison group.
Cleveland, OhioAges 18 years+ - NCT05408728Enrolling by invitation
Check how sugar absorption predicts weight loss after endoscopy
This study looks at whether a person’s “sugar absorption” pattern can help predict how much weight they will lose. It involves an endoscopy (a look inside the upper digestive tract) as part of routine care, and then matching the results to future weight change.
Jacksonville, FloridaAges 18 years+ - NCT04639778Recruiting
Using a connected scale to track weight after bariatric surgery
This study tests whether a connected scale can help monitor your weight over time after gastric bypass or sleeve surgery. It may help your care team spot changes earlier, by sending weight information from your home.
Boulogne-sur-MerAges 18 years+ - NCT04922333RecruitingPhase 3
Bisphosphonate to prevent bone loss after sleeve weight-loss surgery
This study looks at whether a bisphosphonate medicine can reduce bone loss after sleeve gastrectomy (a type of weight-loss surgery). If you had the surgery, it may help protect your bones while you recover and lose weight.
Winston-Salem, North CarolinaAges 30 years+ - NCT04411823Recruiting
Predicting reflux after stomach sleeve surgery
This trial looks at how to predict who will develop acid reflux after a “stomach sleeve” operation. It may help doctors choose the safest plan before surgery and better prevent reflux afterward.
Orlando, FloridaAges 18 years+ - NCT04232566Recruiting
Study links in obesity surgery and liver scarring
This study looks at how the immune system relates to liver scarring in people with obesity who are getting gastric bypass surgery. If you qualify, you may help doctors better understand liver disease and who is at higher risk.
Scottsdale, ArizonaAges 30–70 - NCT04141592Recruiting
Study immune and disease changes in fatty liver
This study looks at what drives non-alcoholic fatty liver disease and how it affects the body, including immune-related changes. You may be invited if you have confirmed fatty liver disease or, alternatively, if you are a healthy person with no liver disease.
London, Greater LondonAges 18 years+ - NCT03519906Recruiting
Bariatric surgery study measuring how metoprolol is absorbed
This study looks at how metoprolol (a blood-pressure medicine) gets absorbed in the body before and after bariatric weight-loss surgery. If you’re preparing for gastric bypass or sleeve surgery, this may help researchers understand dosing and medicine absorption changes after surgery.
TrondheimAges 18–70
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Common questions
- Are there clinical trials for bariatric surgery?
- Yes. Clin2 currently lists 238 recruiting bariatric surgery studies from the U.S. registry, each rewritten for real people, not researchers, so you can see what it’s testing and who it’s for.
- How do I know if I qualify for a bariatric surgery trial?
- Each study lists its eligibility criteria — rules about age, diagnosis, and prior treatments. On every Clin2 trial page we explain these in words written for real people and offer a short, optional pre-screen for a fit read. The study team makes the final decision.
- Does it cost anything to join a bariatric surgery trial?
- Using Clin2 is always free. Many trials cover the cost of the study treatment and related visits; some reimburse travel. The study team explains exactly what’s covered before you decide.
Related conditions
Clin2 helps you find and understand clinical trials and does not provide medical advice. Study data comes from ClinicalTrials.gov. Talk with your doctor about whether a specific trial is right for you.