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
- NCT06700044Recruiting
Probiotics for high-risk pregnancy
This study tests whether taking a probiotic supplement during pregnancy can help prevent complications in women at risk for preeclampsia. You would take a daily probiotic or placebo pill from about 20 weeks until delivery.
LundAges 18 years+ - NCT07682532Recruiting
Theanine and Mediterranean diet for Parkinson's symptoms
This trial tests whether a supplement called L-theanine and a Mediterranean diet can improve sleep, digestion, and inflammation in early-stage Parkinson's disease. It may help if you are in stage 1 and live with a healthy partner.
IstanbulAges 50–80 - 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+ - NCT06721949RecruitingPhase 2/Phase 3
Taurine for long COVID symptoms
This trial tests if taking taurine, a natural amino acid supplement, can help reduce lingering symptoms of COVID-19 that last for months. If you have had COVID-19 and still have symptoms like fatigue or brain fog for at least 2 months after 3 months from your infection, this study might be for you.
Edmonton, AlbertaAges 18 years+ - NCT06723119Recruiting
Resveratrol supplement for exercise and recovery in men
This study tests whether a daily supplement called resveratrol (found in some foods) can help active men exercise better and recover faster. You'll take either resveratrol or a placebo, follow a diet, and complete fitness tests.
Orlando, FloridaAges 18–40 - NCT06727253Recruiting
Glycan supplement study for Crohn's disease after surgery
This trial tests whether a glycan supplement can prevent Crohn's disease from coming back after surgery to remove the diseased part of the small and large intestine. It may help people who have had this specific surgery and are not taking certain other treatments.
Lisbon, Lisbon DistrictAges 18–75 - 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 - 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+ - NCT06781619Recruiting
Plant-based drink study for people at risk of malnutrition
This study tests a plant-based, high-energy, high-protein drink for people who are at medium or high risk of malnutrition. You would replace your current prescribed supplement with either a plant-based or dairy-based drink for 8 weeks to see how it affects your nutrition.
MechelenAges 18 years+ - 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+ - NCT06815237RecruitingPhase 2/Phase 3
Ketone supplement and alcohol effects on brain metabolism
This study looks at how a ketone supplement and alcohol affect your brain's metabolism. You will be asked to visit the lab, have an MRI, and possibly take the supplement or drink alcohol.
Philadelphia, PennsylvaniaAges 21–65 - NCT06821802Recruiting
Protein supplement for low sodium from SIAD
This trial tests if a protein supplement can help patients with low sodium caused by a condition called SIAD. If you have SIAD and low sodium, you may be able to join.
BaselAges 18 years+ - NCT06826105Recruiting
Enzyme supplement and nutrition drink for older hospitalized patients
This trial tests if a combination of a pancreatic enzyme supplement (pancrelipase) plus a high-protein nutrition drink can help older hospitalized patients who are at risk for malnutrition. It aims to see if this treatment improves weight, strength, and recovery during and after the hospital stay.
AarauAges 70 years+ - NCT06826222Recruiting
Sodium bicarbonate for better running performance in women
This study tests whether taking sodium bicarbonate (a common food ingredient) before a run can help women runners perform better in endurance events like a 10 km race. It is for recreational female runners who already run at a good pace.
Ankara, AnkaraAges 18–40 - NCT06834594RecruitingPhase 4
Bleeding patterns in teens with Turner syndrome on progesterone
This study looks at how different ways of taking progesterone (a hormone given along with estrogen) affect bleeding patterns in teens with Turner syndrome. The goal is to find the best hormone schedule to cause regular, predictable periods.
Kansas City, MissouriAges 12–20 - NCT06847373Recruiting
Vitamin D for teens with obesity
This study is testing whether vitamin D supplements can help teens with obesity. It is open to participants aged 10 to 18 who live in Mexico City and have obesity based on their BMI.
MéxicoAges 10–18 - NCT06851676Recruiting
Testing mineral water's effects on bone and muscle health
This trial tests if drinking Fonte Fausta® mineral water can help improve bone and muscle health in people with weak bones (osteopenia or osteoporosis). Researchers want to see if this water has special benefits beyond regular water.
Naples, ItalyAges 65 years+ - NCT06861062Recruiting
Vitamin D and yeast beta-glucan for type 2 diabetes
This trial tests if taking vitamin D3 and yeast beta-glucan supplements can help control blood sugar and lower heart disease risk in people with type 2 diabetes. It may be an option for those who want to see if supplements can improve their diabetes management.
Nanning, GuangxiAges 40–79 - NCT06867861Recruiting
Can fiber supplements help manage gestational diabetes?
This study tests whether taking fiber supplements can help control blood sugar during pregnancy without needing medication. It is for women with gestational diabetes who currently do not require medication.
Norfolk, VirginiaAges 18–50 - NCT06869486Recruiting
How insomnia affects DNA, heart health, and lifestyle
This study looks at how insomnia affects your DNA, heart health, metabolism, and daily habits. It includes different groups of people—healthy adults, athletes, older adults, university students, and people with metabolic syndrome—to compare the impact of sleep problems.
Ensenada, Estado de Baja CaliforniaAges 18–75 - NCT06870331Recruiting
Probiotics for stomach health after spinal cord injury
This study tests if taking probiotics and prebiotics can help with digestion, gas, constipation, and other stomach issues in people with long-term spinal cord injury.
Nottwil, Canton of LucerneAges 18 years+ - NCT06895070Recruiting
Heart transplant study using a special preservation machine
This trial tests a special machine that preserves donor hearts for longer periods before transplant. It may help people waiting for a heart transplant who need a heart from a donor that may be older or has some heart risks.
La Jolla, CaliforniaAges 18 years+ - NCT06918054RecruitingPhase 4
Liver protection for kids with leukemia
This trial tests if a medication can protect the liver during chemotherapy for children and teenagers newly diagnosed with acute lymphoblastic leukemia (ALL). It aims to reduce liver damage caused by treatment.
CairoAges 2–18 - NCT06928298Recruiting
A cognitive screening study for Spanish speakers aged 60+
This study tests a new, easy-to-use cognitive screening tool on an iPad for older adults who speak Spanish. It aims to help primary care doctors detect thinking or memory changes early.
Austin, TexasAges 60 years+
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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.