Clinical trials
Supplementation clinical trials
Below are recruiting supplementation clinical trials, each written for real people, not researchers. We’re tracking 680 recruiting studies, each written for real people, not researchers, below.
Recruiting studies
- NCT07317830Recruiting
Comparing vitamin D3 forms for low vitamin D
This study compares different forms of vitamin D3 to find which works best for adults with low vitamin D levels. If you have a vitamin D deficiency and are generally healthy, this trial may help determine the most effective supplement for you.
BelgradeAges 18–80 - NCT07345260Recruiting
Can a nutritional supplement improve your sleep?
This trial tests a nutritional supplement to see if it can improve your sleep quality. You'll need to wear a smart ring and stop using other sleep aids for about 7 weeks.
Santa Monica, CaliforniaAges 35–65 - 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 - NCT07393958Recruiting
Can food supplements improve quality of life with endometriosis pain?
This study tests if a food supplement (Doliral®) can help reduce pelvic pain and improve daily life in women with endometriosis. It is for those with mild to moderate endometriosis (stages I–III) who have had pain for at least three months but do not need surgery right now.
BarcelonaAges 18 years+ - NCT07395973Recruiting
Ketogenic drink and muscle health in older adults
This study tests whether a special ketogenic drink taken for 4 weeks can improve how your body uses energy and help maintain muscle health. It may be a good option if you are between 60 and 80, overweight but not diabetic, and not very active.
MaastrichtAges 60–80 - NCT06826924Recruiting
Fasting or ketones for prostate cancer
This trial tests whether a 7-day water-only fast or taking ketone supplements can help treat prostate cancer. You would have a biopsy before and after to see how the tumor responds.
Baltimore, MarylandAges 18 years+ - NCT07400796Recruiting
Prenatal vitamin study for pregnant women in Cambodia
This study looks at giving multiple micronutrient supplements (MMS) to pregnant women in Takeo, Cambodia. It aims to understand how well the health system can provide these vitamins instead of the usual iron and folic acid.
Phnom PenhAges 18 years+ - NCT07427017RecruitingPhase 2
Selenium for Ulcerative Colitis Patients on Biologics
This trial tests whether taking selenium supplements can help people with moderate to severe ulcerative colitis that is being treated with advanced therapies (biologics). The goal is to see if selenium can improve symptoms and reduce inflammation.
Chicago, IllinoisAges 18–85 - NCT07451977Recruiting
Oxygen during a 6-minute walk test for lung disease
This trial tests whether adding extra oxygen during a 6-minute walk test helps people with chronic lung disease breathe better. It is for people with COPD or interstitial lung disease who have low oxygen levels, either during exercise or all the time.
Lumezzane, BresciaAges 18 years+ - NCT07469462Recruiting
High-dose vitamin B6 for depression and anxiety
This study tests whether high doses of vitamin B6 can help reduce symptoms of anxiety and depression. If you have mild to moderate anxiety or depression, you may be able to participate.
Reading, EnglandAges 18–41 - NCT07471048Recruiting
Magnolia supplement for psoriasis immune health
This trial tests whether a magnolia dietary supplement can improve immune markers in people with psoriasis. If you have stable psoriasis (for at least 6 months) and are not using certain strong medications, you may be able to participate from home by using a smartphone app and mailing blood samples.
Englewood, New JerseyAges 18 years+ - NCT07497555Recruiting
Pecan nut oil for inflammation in overweight adults
This study tests if taking pecan nut oil every day can reduce inflammation in adults who are overweight. It may help improve health and lower the risk of future disease.
Monterrey, Nuevo LeónAges 18–55 - NCT07497698Recruiting
Saffron supplement for better sleep in adults
This study tests whether taking a saffron extract supplement can help improve sleep in middle-aged adults with mild to moderate sleep troubles. You would take a daily supplement for a few weeks and report how well you sleep.
Granada, GranadaAges 18–65 - NCT07497932Recruiting
Nutritional effects in heart surgery
This trial looks at whether adding a probiotic supplement before cardiovascular surgery can improve recovery. It studies the link between nutrition, gut health, and surgical outcomes.
New Taipei CityAges 50–80 - NCT07534852Recruiting
Nutrition and exercise support for colon cancer surgery patients
This study tests whether nutrition support and exercise help patients with early-stage colon cancer recover better after surgery. Researchers will provide dietary guidance and a supervised exercise program tailored to your needs.
Málaga, MalagaAges 18–75 - NCT07543562RecruitingPhase 3
Selenium supplement for heart failure patients
This study tests whether taking selenium (a mineral supplement) helps heart failure patients feel better and live longer. Researchers will follow patients over time to see if selenium reduces symptoms and hospital visits.
OsloAges 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+ - NCT07584278Recruiting
Probiotics and Biomarkers for Irritable Bowel Syndrome
This study tests whether probiotics (beneficial bacteria) can help reduce irritable bowel syndrome (IBS) symptoms and change certain markers in your gut. You'll take a probiotic supplement for 12 weeks while researchers track how your symptoms and gut health change.
GothenburgAges 18 years+ - NCT07585994Recruiting
Probiotic supplement for long-standing type 1 diabetes
This study tests whether taking a specific probiotic (a beneficial bacteria) for 4 weeks can improve immune function and metabolism in people who have had type 1 diabetes for at least 5 years. Researchers believe this probiotic may help the body's remaining insulin-producing cells work better.
AmsterdamAges 18 years+ - NCT07586839Recruiting
Nutritional Supplement for Muscle Recovery in Young Men
This study tests whether a special nutritional supplement helps muscles recover better after exercise. Researchers will compare how well the supplement works in healthy young men who exercise regularly.
Wageningen, GelderlandAges 18–35 - NCT07615673Recruiting
Artichoke supplement study measuring body markers
This study tests an artichoke by-product supplement to see how your body processes and uses it. Researchers will measure markers in your blood and other samples to understand how the supplement affects your digestive health and metabolism.
Pamplona, NavarreAges 18–75 - NCT07642869Recruiting
Vitamins and minerals for healthy aging in middle-aged adults
This study tests whether taking a daily multivitamin and mineral supplement helps middle-aged adults stay healthier and more active as they age. Researchers will track changes in your fitness, energy, and overall wellness over the study period.
La Jolla, CaliforniaAges 40–60 - NCT07651514Recruiting
Magnesium and Melatonin for Better Sleep and Leg Cramps
This study tests whether taking daily magnesium and melatonin supplements can help improve sleep quality and reduce nighttime leg cramps in adults. You'll wear a special ring to track your sleep and use a smartphone app to log your experiences.
Palm Beach Gardens, FloridaAges 40–75 - NCT07652684RecruitingPhase 4
Fat supplement to help premature babies' lungs
This study tests whether adding a special fat supplement to the feeding of very premature babies can help prevent or reduce lung damage, which is common in babies born early. The supplement is given through a feeding tube.
ThessalonikiAges 6 months–7 months
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Common questions
- Are there clinical trials for supplementation?
- Yes. Clin2 currently lists 680 recruiting supplementation 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 supplementation 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 supplementation 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.