Clinical trials
Probiotic clinical trials
Below are recruiting probiotic clinical trials, each written for real people, not researchers. We’re tracking 225 recruiting studies, each written for real people, not researchers, below.
Recruiting studies
- NCT07462481Recruiting
Probiotic study for constipation relief
This trial tests whether a probiotic can help people with constipation. You may be eligible if you have fewer than 3 bowel movements per week or hard, lumpy stools.
Suzhou, JiangsuAges 18–65 - NCT07275866Recruiting
Probiotic study for people with constipation
This study tests whether a multi-strain probiotic can help relieve constipation. You would stop other constipation treatments and track your symptoms with a daily diary.
LondonAges 18–70 - NCT06960369RecruitingPhase 1
Brain stimulation and probiotics for diarrhea-predominant IBS
This trial tests whether combining a type of brain stimulation (repetitive transcranial magnetic stimulation) with a probiotic tablet can help people with diarrhea-predominant irritable bowel syndrome. It aims to improve symptoms by targeting both the brain and the gut.
Suzhou, JiangsuAges 18–70 - NCT07246161RecruitingPhase 2
Tracking probiotics from mouth to vagina in healthy women
This study tests whether probiotic bacteria taken by mouth can be found in the vagina of healthy women. It involves taking a daily probiotic for 4 weeks and providing samples (stool, vaginal swabs, and skin swabs) to track where the probiotics go.
MontrealAges 18–50 - NCT07339280Enrolling by invitation
Probiotics for COPD: symptoms, lungs, and inflammation
This study tests whether taking a probiotic can improve symptoms, lung function, and inflammation in people with COPD. It is for adults with stable COPD who have not had a flare-up or treatment change in the last two months.
KarlovacAges 18 years+ - NCT06765057RecruitingPhase 2/Phase 3
Probiotics for Depression and Metabolic Health
This trial tests whether taking a probiotic supplement can improve both depression symptoms and metabolic health (like waist size, blood sugar, and cholesterol) in people with major depression. It may be a good fit if you are already on an antidepressant and have signs of metabolic syndrome.
Riyadh, Riyadh RegionAges 18–65 - NCT07141888Recruiting
Probiotic supplement for high uric acid
This study tests whether a probiotic food supplement can lower high uric acid levels, which often cause gout. It might help you if your uric acid is high but you haven't had a recent gout attack.
ÖrebroAges 18–80 - NCT07081100Recruiting
Probiotics for stomach and bowel health improvement
This trial tests whether a probiotic supplement can help people with common stomach or bowel issues like indigestion or constipation that are not caused by another disease. You take the probiotic daily to see if it improves your symptoms.
Suzhou, JiangsuAges 18–65 - NCT06904573RecruitingPhase 2
Probiotics for advanced bladder cancer
This trial tests if taking probiotics can help people with advanced bladder or urinary tract cancer that has spread. It's for those who have already tried immunotherapy. The goal is to see if probiotics can improve treatment outcomes.
Guangzhou, GuangdongAges 18 years+ - NCT06847919Recruiting
Probiotic yogurt for chronic constipation
This study tests whether eating a special probiotic yogurt can help relieve chronic constipation. It may be a simple, natural addition to your diet with minimal side effects.
Suzhou, JiangsuAges 18–65 - NCT06959758RecruitingPhase 4
Probiotics for childhood constipation
This study tests whether a probiotic supplement (BioKid LR) can help children with functional constipation — a condition where a child has hard, infrequent bowel movements with no other medical cause. The probiotic contains nine different types of good bacteria, including L. reuteri.
AfulaAges 6 months–17 years - NCT06659380Recruiting
Probiotic for postmenopausal women with vaginal infection
This trial is testing a probiotic (friendly bacteria) treatment for postmenopausal women who have bacterial vaginosis. It aims to see if the probiotic can improve vaginal health.
Kendari, South East SulawesiAges Any age - NCT06717659Recruiting
Probiotics for lung rehab in COPD patients
This trial tests if adding probiotics (healthy bacteria you take as a supplement) to your regular lung rehab program helps people with COPD breathe better and feel stronger.
New Taipei CityAges 18 years+ - NCT06720558Recruiting
Placebo probiotic effects on gut health in mild GI symptoms
This study tests whether a placebo probiotic can improve gut health and overall well-being in people with mild digestive issues like gas, bloating, or irregularity. If you have mild symptoms that don't stop your daily activities, this trial may help understand if believing you're taking a probiotic can make you feel better.
MilanAges 20–65 - NCT06781827Recruiting
Probiotics for newly diagnosed IBD
This study tests whether taking probiotics can help prevent or treat inflammatory bowel disease (IBD) in people recently diagnosed. It aims to see if friendly bacteria can calm gut inflammation and improve symptoms.
Suqian, JiangsuAges 18 years+ - NCT06989177Recruiting
Can a probiotic help with body weight?
This trial tests whether taking a probiotic (a good bacteria supplement) can help with body weight. It is for healthy adults, and also for overweight or obese people who have certain weight-related health issues.
Hangzhou, ZhejiangAges 20–50 - NCT06998823Recruiting
Probiotics during cancer therapy study
This study looks at how taking a probiotic supplement affects survival, treatment response, and gut bacteria in people undergoing cancer therapy. It may help you understand if adding probiotics can improve your treatment outcomes.
New Taipei CityAges 20 years+ - NCT07046897Recruiting
Probiotic study: Gut bacteria and your health
This trial tests if eating probiotic bacteria changes the types of bacteria in your gut. It may help researchers understand how probiotics affect overall health.
LundAges 18–65 - NCT07047339RecruitingPhase 2/Phase 3
Probiotic 6600 for colitis patients
This trial tests whether adding Probiotic 6600 to your usual treatment can help manage colitis, including ulcerative colitis or Crohn's disease. It aims to see if the probiotic improves symptoms and is safe to use.
ShanghaiAges 18–75 - NCT07356869Recruiting
Mouthwash study for school children's dental health
This study compares two mouthwashes (one with probiotics and one with a natural ingredient called ethyl lauroyl arginate) to see which is better at reducing cavity-causing bacteria, plaque buildup, and keeping the mouth at a healthy pH level. It may help children between 6 and 12 years old who have mild to moderate plaque.
CairoAges 6–12 - NCT07360106Recruiting
Probiotic supplement for ongoing celiac symptoms
This trial tests if a daily probiotic drink (Symprove) can help people with celiac disease who still have stomach or gut symptoms even after following a strict gluten-free diet and having healed intestines.
Sheffield, South YorkshireAges 18–65 - NCT07512557Recruiting
Probiotic Safety and Effectiveness Study for Women
This research tests a new probiotic supplement to see if it's safe, easy to take, and works well. You'll take the probiotic for several weeks and answer questions about how you feel and any side effects.
Ottawa, OntarioAges 18–40 - NCT07600008RecruitingEarly Phase 1
Probiotics as a supplement for reflux disease management
This early-stage trial tests whether a probiotic supplement can help support treatment of reflux disease (GERD) in patients already taking a standard reflux medication. Researchers want to see if adding probiotics might improve symptoms or overall digestive health.
OlomoucAges 40–55 - NCT07779265Recruiting
Probiotic supplement for gut health in healthy adults
This trial tests a daily probiotic supplement's effect on digestion, immune health, and overall well-being. If you're a healthy adult, you may help discover if this product can make you feel better day-to-day.
TrierAges 18–65
Hear when a new Probiotic trial opens
We’ll email you when one opens — at most once a week, no account needed, unsubscribe anytime.
Common questions
- Are there clinical trials for probiotic?
- Yes. Clin2 currently lists 225 recruiting probiotic 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 probiotic 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 probiotic 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.