Clinical trials
Supplementation clinical trials
Below are recruiting supplementation clinical trials, each written for real people, not researchers. We’re tracking 671 recruiting studies, each written for real people, not researchers, below.
Recruiting studies
- NCT07508657RecruitingPhase 4
Progesterone after letrozole for intrauterine insemination
This trial tests whether taking progesterone after a type of fertility treatment called IUI can improve success rates. The study focuses on people who are using a drug called letrozole to stimulate the ovaries.
CopenhagenAges 18–37 - NCT06753565RecruitingPhase 2
L-carnitine supplement for rheumatoid arthritis
This trial tests whether adding L-carnitine (a natural substance) to your current treatment helps reduce rheumatoid arthritis symptoms. It could be an option if your arthritis is still active despite taking standard medications.
Cairo, DemerdashAges 18–60 - NCT07499414Recruiting
Bile acid supplement for gut health in adults
This study tests whether a bile acid supplement called 7-keto lithocholic acid can positively affect your gut bacteria and reduce disease risks. Healthy adults aged 18-65 are needed.
ReadingAges 18–65 - NCT07503496Recruiting
Biobran supplement for breast cancer chemo support
This trial tests if a supplement called Biobran (made from rice bran) can help support people with breast cancer who are receiving chemotherapy. It may reduce side effects or improve treatment tolerance.
TaichungAges 20–65 - NCT06773650Recruiting
Managing lactose intolerance with diet and enzyme supplements
This trial tests whether diet tracking and lactase enzyme supplements help people with lactose intolerance manage their symptoms. It uses an online survey to gather information.
MilanAges 18 years+ - NCT07484061Recruiting
Drinkable supplement for hair loss in women on weight-loss drugs
This trial tests if a special drinkable supplement can help prevent or reduce hair loss in women who are taking a GLP-1 or GIP receptor agonist (a type of weight-loss or diabetes medication). The study looks for women who have just started this medication or have been on it for less than 3 months.
Madrid, MadridAges 35 years+ - NCT07487623Recruiting
Nutritional supplement for liver protection in hepatitis C
This trial tests whether a special nutritional supplement can protect the liver in people with chronic hepatitis C. If you have mild to moderate liver damage and meet the criteria, you may be able to join.
Guadalajara, JaliscoAges 18–69 - NCT07481578Recruiting
Exercise and gut health study for active men
This study looks at how your training load affects your gut bacteria and how that relates to exercise performance and muscle health. It may help understand overreaching in healthy men.
Leuven, Vlaams BrabantAges 18–45 - NCT07485296RecruitingPhase 2
Postbiotics with pembrolizumab for advanced head and neck cancer
This trial tests whether adding postbiotics (beneficial bacteria byproducts) to the standard immunotherapy drug pembrolizumab can improve your immune system's response against advanced or metastatic head and neck squamous cell carcinoma.
Rozzano, MilanoAges 18 years+ - NCT05188079Recruiting
Test whether quick nitrate supplements change blood vessel function
This study checks how an acute (short-term) nitrate supplement affects how well your blood vessels work. It may help researchers understand whether these effects differ among Hispanic, Black, and White participants, in otherwise healthy adults.
Austin, TexasAges 18–65 - NCT06781970Recruiting
Vitamin C for eye cell protection during cataract surgery
This trial tests whether taking vitamin C before and after cataract surgery can help protect the inner layer of the eye. It is for people aged 60 or older with hard, age-related cataracts who are having phacoemulsification surgery.
Jakarta, DKI JakartaAges 60 years+ - NCT06642428Recruiting
Vitamin D for breast cancer treatment before surgery
This trial tests whether taking vitamin D pills during chemotherapy or targeted therapy (before breast cancer surgery) can improve how well the treatment works and reduce side effects. It is for women with low vitamin D levels.
Xining, QinghaiAges 18–80 - NCT06642441Recruiting
Vitamin D for reducing chemotherapy side effects in breast cancer
This trial tests whether taking vitamin D supplements can reduce side effects from chemotherapy in people with breast cancer. It is for patients with low vitamin D levels who are about to start their first chemotherapy treatment.
Xining, QinghaiAges 18–80 - NCT07479173Recruiting
How a study ingredient affects protein digestion in healthy adults
This trial tests whether a study ingredient called P24 changes how your body breaks down and uses protein from a meal. It may help researchers understand ways to support muscle health as we age.
Davis, CaliforniaAges 45–75 - NCT07472426Recruiting
Creatine for brain and kidney health after exercise in heat
This study tests if taking creatine supplements can protect your brain and kidneys during intense exercise in hot conditions. You'll exercise and have your thinking and kidney function checked afterward.
Cedar Falls, IowaAges 18–45 - NCT04775381RecruitingPhase 3
Vitamin D before thyroid surgery to prevent low calcium
This study tests whether taking vitamin D (cholecalciferol) before a total thyroid removal can reduce the risk of developing low blood calcium afterward. If you’re having your thyroid removed, the results may help prevent symptoms like tingling, cramps, or spasms caused by low calcium.
AuxerreAges 18 years+ - NCT06155708Recruiting
Ketone drink study for women with PCOS
This study tests if a special ketone drink can help women with polycystic ovary syndrome (PCOS). Researchers want to see if it improves health markers related to the condition.
Montreal, QuebecAges 18–40 - NCT05936346Recruiting
Check safety of a Salvia extract dietary supplement
This trial tests whether a Salvia-based extract (taken like a dietary supplement) is safe and well-tolerated in generally healthy adults. It also checks whether people can follow the study diet and activity routines during the trial.
LuganoAges 55–65 - NCT07465497Enrolling by invitation
Preventing Chemo Brain with Prebiotics and Synbiotics
This trial tests whether taking a special blend of prebiotics and synbiotics (friendly bacteria and food for them) can help prevent or reduce memory and thinking problems that sometimes happen during chemotherapy for breast cancer.
Zapopan, JaliscoAges 18 years+ - NCT07470645Recruiting
Probiotics for stress and anxiety in students
This study tests whether taking a probiotic supplement can help reduce stress and anxiety in students. If you are a student aged 18-40 who experiences moderate stress and mild anxiety, and you don't have certain health conditions, you may be able to join.
LublinAges 18–40 - NCT07469527Recruiting
Tonic for stress in healthy adults
This study tests if a tonic called Feel Free Classic Tonic can help lower stress in healthy adults. You will take the tonic, and the researchers will check your stress levels and how your body processes the drink.
Guelph, OntarioAges 21–55 - NCT07463352Recruiting
Pre-surgery nutrition for frail seniors with hip fractures
This study tests if giving a special protein drink before surgery helps frail older adults with a broken hip recover better. It might reduce complications after surgery.
DüzceAges 65 years+ - NCT07471542Recruiting
Copper supplements for cirrhosis patients
This trial tests whether taking copper supplements can help people with cirrhosis (scarring of the liver) who have low copper levels or symptoms related to copper deficiency. It aims to see if this can improve their health.
Seattle, WashingtonAges 18 years+ - NCT07466420Recruiting
Quercetin for fibrotic lung disease
This trial tests whether taking quercetin, a natural supplement, can help people with fibrotic interstitial lung diseases (a group of conditions that cause scarring in the lungs). If you have been diagnosed with idiopathic pulmonary fibrosis (IPF) or another fibrotic ILD and are on standard treatments, you may be able to join.
Heraklion, CreteAges 18 years+
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Common questions
- Are there clinical trials for supplementation?
- Yes. Clin2 currently lists 671 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.