Clinical trials
Dietary Supplement clinical trials
Below are recruiting dietary supplement clinical trials, each written for real people, not researchers. We’re tracking 97 recruiting studies, each written for real people, not researchers, below.
Recruiting studies
- NCT04573439Recruiting
Protein needs study for healthy active children
This study looks at how much protein children who are already in the “normal weight” range need to support an active lifestyle. It may help researchers fine-tune nutrition guidance for kids who are active and healthy.
Little Rock, ArkansasAges 8–10 - NCT06852014Recruiting
Nutritional supplement study for malnourished pancreatic cancer patients
This trial tests whether a special drink called Peptamen 1.6 can help improve nutrition and recovery in patients who are malnourished or at risk and have had surgery for pancreatic cancer. It aims to understand how the supplement affects the body right after surgery.
Málaga, MálagaAges 18 years+ - NCT07380022Recruiting
Iron and zinc supplements for adults with chronic diseases
This study tests whether two dietary supplements can improve iron and zinc levels in adults with Crohn's disease, ulcerative colitis, hypertension, anemia, or multiple sclerosis. It aims to see if patients find them easy to take and if they help the body absorb these minerals better.
Trikala, ThessalyAges 18 years+ - NCT07177183Recruiting
Low creatinine as a sign of longer breathing tube use
This study looks at whether low blood creatinine levels can help predict which patients will need a breathing machine for a long time or have trouble coming off it. If you are under 18 and in a post-ICU care unit, you may be able to join.
BrnoAges 18 years+ - NCT07053657Recruiting
Vitamin D for heart health in overweight teens
This study looks at whether giving vitamin D can improve heart and metabolic health in overweight or obese teens who have low vitamin D levels. It may help lower risks like high blood sugar or cholesterol.
Anqing, AnhuiAges 10–16 - NCT07131384Recruiting
Nitrate supplement and metformin for prediabetes
This trial tests whether adding a nitrate supplement to metformin helps people with prediabetes. It looks at how the two treatments interact, especially when you start exercising. The study might help you if you have prediabetes, are between 18 and 60 years old, and don't exercise much.
Charlottesville, VirginiaAges 18–60 - NCT07216755Recruiting
Breathing training and nitrate for altitude exercise
This study tests whether breathing training and a natural nitrate supplement (from beets) can improve how well you exercise in conditions that simulate high altitude. You'll do cycling workouts while we measure your performance.
Daytona Beach, FloridaAges 18–40 - NCT06548048Recruiting
Dietary supplement for fat burning in overweight women
This study tests whether a dietary supplement can help your body burn fat more efficiently. It is for overweight women with regular menstrual cycles who are not using weight loss medications.
Addison, IllinoisAges 18–50 - NCT07625202Recruiting
Creatine Supplements During GLP-1 Weight-Loss Therapy
This trial tests whether adding creatine (a natural muscle-building supplement) helps preserve muscle and strength while taking GLP-1 medications like Ozempic or Wegovy. These medications help with weight loss but can sometimes cause muscle loss, so researchers want to see if creatine prevents that.
Saskatoon, SK - SaskatchewanAges 18 years+ - NCT06669819Recruiting
Vegan diet and supplements during pregnancy and childhood
This study looks at how a vegan diet, with or without supplements, affects pregnancy and early childhood. It includes vegan parents and their children up to age 5, as well as medical experts who advise vegan families.
Vienna, AustriaAges 18 years+ - NCT07385144Recruiting
Dietary supplement study in healthy children
This study tests whether a dietary supplement can affect certain blood markers in healthy children. It will help researchers see if the supplement has any effects on the body.
San Francisco, CaliforniaAges 4–15 - NCT06433310RecruitingPhase 4
A dietary supplement's effect on gut fungi in healthy adults
This study tests whether a dietary supplement (L-phenylalanine) can affect the natural balance of fungi in the gut. Healthy volunteers take the supplement for a short time, and researchers check how it changes their gut fungi.
New York, New YorkAges 18 years+ - NCT07670234Recruiting
Dietary Supplements and Cancer Treatment
This study looks at how dietary supplements (like vitamins and herbs) affect cancer patients who are on treatment. It checks if supplements cause side effects, change how medications work, or interact with each other.
RabatAges 18 years+ - NCT07579845Recruiting
Dietary supplement study on aging markers and body health
This study tests whether a dietary supplement containing humic and fulvic acids (natural compounds) can improve markers of biological aging, inflammation, and how your body handles toxins. Researchers will check blood samples to see if the supplement affects these markers over time.
Richmond, VirginiaAges 40 years+ - NCT06841458Recruiting
Dietary supplement for hair growth in men with mild to moderate baldness
This study tests whether a dietary supplement helps hair growth in men with mild to moderate male pattern baldness. It lasts 6 months, and you will not know if you are getting the real supplement or a placebo.
Valencia, ValenciaAges 18–45 - NCT07000500Enrolling by invitation
Nutritional supplement for memory decline in older adults
This trial tests whether a nutritional supplement can help slow or improve memory loss in older adults who have mild cognitive decline (noticeable changes in thinking skills that are not yet dementia). You will take a daily supplement and attend regular check-ups.
Vila Nova de Famalicão, Braga DistrictAges 65 years+ - NCT06916208Recruiting
Capsinoid supplement study for obese teens
This study tests whether a supplement called capsinoid can help activate brown fat in teenagers with obesity. Brown fat is a type of body fat that burns calories, so this could be a new way to help with weight management.
Palavas-les-FlotsAges 11–18 - 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 - NCT06138106Recruiting
Nutritional supplement for collagen in young adults
This study tests a nutritional supplement designed to help your body make more collagen, which is important for skin, joints, and bones. It is for healthy young adults to see if the supplement can safely boost collagen production.
Davis, CaliforniaAges 18–30 - NCT07453212Enrolling by invitation
Food supplement for dry eye caused by meibomian gland issues
This trial tests a food supplement designed to improve dry eye symptoms by targeting the microbiome. It may help if you have dry eye due to meibomian gland problems and are not using contact lenses or certain other eye treatments.
IstanbulAges 18–65 - NCT06956612Recruiting
Dietary nitrate supplements and your oral health
This trial tests whether taking dietary nitrate supplements can improve oral health in healthy adults. It may help you understand how simple diet changes could support your mouth's natural defenses.
NewcastleAges 18–65 - NCT04829136Recruiting
Oral fiber supplement during donor stem cell transplant
This trial tests whether taking a fiber supplement by mouth during a donor stem cell transplant helps patients tolerate treatment and potentially recover better. It’s specifically for adults who are planning a donor (allogeneic) transplant for blood cancers.
Seattle, WashingtonAges 18 years+ - NCT06044168Recruiting
Nutritional supplement for muscle growth in cerebral palsy
This study tests whether a nutritional supplement can help build muscle in children with spastic cerebral palsy. It may be a good fit if you have trouble with walking and have not had certain treatments recently.
Leuven, Vlaams-BrabantAges 4–10 - NCT07502924Recruiting
Testing Geranylgeraniol supplements for muscle health
This study tests whether taking a supplement called geranylgeraniol (GG) can improve muscle health. It is looking for physically active adults who are willing to follow specific dietary rules and avoid certain foods and supplements during the study.
Saint Charles, MissouriAges 30–60
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Common questions
- Are there clinical trials for dietary supplement?
- Yes. Clin2 currently lists 97 recruiting dietary supplement 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 dietary supplement 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 dietary supplement 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.