Clinical trials
Volunteers clinical trials
Below are recruiting volunteers clinical trials, each written for real people, not researchers. We’re tracking 526 recruiting studies, each written for real people, not researchers, below.
Recruiting studies
- NCT04600570Recruiting
Ultrasound measurement of the eye nerve in adults
This study uses an ultrasound scan to measure the space around the optic nerve in healthy adults. It helps researchers better understand normal ultrasound measurements for comparison in future eye or brain-related conditions.
TaipeiAges 20 years+ - NCT04657042Recruiting
4D MRI scans to guide lung or liver cancer radiation
This trial tests whether special “4D” MRI scans can improve precision radiation planning for people with lung or liver cancer. You may get MRI scan data to better account for tumor movement, alongside your usual radiation treatment.
Charlottesville, VirginiaAges 18–82 - NCT04474015Enrolling by invitation
Testing a brain-stimulation setup for comfortable sleep
This study tests how comfortable a noninvasive brain stimulation method (putting small electrodes on the head) feels during sleep. It’s looking for healthy adults who fit specific sleep and health limits so results can be compared cleanly.
Ages 18–39 - NCT04354064Recruiting
Blood DNA test to see early treatment response in solid tumors
This study looks at circulating tumor DNA, which is tiny bits of DNA found in blood, to help assess how solid tumors are responding early. It uses blood samples from healthy adults who are willing to donate.
St Louis, MissouriAges 18 years+ - NCT04286464Enrolling by invitation
Study how pregnancy affects airway inflammation in babies
This study looks at how different pregnancy and birth factors may contribute to airway inflammation in infants who wheeze or have lung conditions. It may help researchers understand why some babies get ongoing breathing problems and how early influences could be linked.
BernAges Any age - NCT04216342RecruitingPhase 1
Testing a new breathing-drug ingredient in healthy adults
This early study (Phase 1) tests how safe and tolerable Fx-5A is, and how the body processes it, in healthy volunteers. It’s mainly looking to understand side effects and drug levels rather than treating a disease.
Bethesda, MarylandAges 18–99 - NCT04198909Recruiting
Testing a new way to measure hearing nerve health
This study uses a painless, non-invasive method to test how well the hearing nerve works in people with normal hearing. It may help doctors better understand hearing loss in the future.
Clermont-FerrandAges 18–55 - NCT03286686Recruiting
Study of thinking and hand skills after brain injury
This study looks at how people with an injury to the back part of the brain (posterior parietal cortex) process what they see and guide their movements. It may help researchers better understand the symptoms and improve future therapies.
BronAges 18–75 - NCT04040608Recruiting
Testing how screen size affects stress ratings
This study looks at whether the size of a computer or phone screen changes how people rate their stress. It may help researchers choose the best way to measure stress in future studies and health apps.
Clermont-FerrandAges 18 years+ - NCT03949647Recruiting
Study bone marrow samples from healthy adults every two years
This study collects bone marrow samples to look at healthy “bone marrow cells” and how they may change with aging. It may help researchers better understand aging biology by comparing samples over time.
Baltimore, MarylandAges 18–120 - NCT03807401Recruiting
Prismatic test study to support daily independence after brain injury
This study tests a new vision-related “prismatic adaptation” task to see if it could help people with daily independence after a brain injury. Because you’d be asked to do technical testing, the main goal is to understand how the test works in healthy people.
BronAges 18–70 - NCT03721822RecruitingPhase 1
Imaging how smoking affects lung inflammation in adults
This Phase 1 study uses special lung imaging to measure inflammation after different types of smoking or vaping. It looks at differences between people and may help researchers understand how smoking-related lung irritation develops.
Philadelphia, PennsylvaniaAges 18–45 - NCT03407079RecruitingPhase 2
Study of sucralose’s effects on digestion of drugs
This study tests whether the sugar substitute sucralose changes how your body absorbs and breaks down certain medicines. You’d take sucralose or a placebo for 4 weeks, visit the clinic, and complete required samples and medicine doses during visits.
Bethesda, MarylandAges 18–60 - NCT03394066Recruiting
Magnetic brain stimulation safety and brain imaging study
This study tests how a non-invasive magnetic stimulation technique affects the brain in healthy volunteers. It involves MRI scans and aims to understand brain function without surgery.
Baltimore, MarylandAges 18–60 - NCT03258580Recruiting
Studying how culture and mind affect how we feel pain
This study looks at how beliefs, mood, and social factors affect how people express and judge pain. It mainly uses pain/heat testing and—if chosen—brain scans to understand why pain reports can differ between people.
Bethesda, MarylandAges 18–60 - NCT03253705Recruiting
Donate small blood samples to study heart and inflammation health
This study collects small blood samples (and sometimes samples during treatment) to help researchers understand diseases involving the heart, inflammation, and blood vessel function. It may help improve future tests and treatments by giving scientists usable human data.
Bethesda, MarylandAges 18–100 - NCT03065335RecruitingPhase 1
Ketamine plus brain imaging to study response in depression
This early-stage study tests how ketamine given once and then repeatedly may change brain signals and related biomarkers in people with major depression. If you’re eligible, the team will use brain imaging and assessments to see who responds and why.
Bethesda, MarylandAges 18–65 - NCT03207854Recruiting
Donate blood and immune samples for cancer, blood, or healthy volunteers study
This study collects blood and immune-related samples from people with cancer, certain immune-related blood conditions, or healthy volunteers. It helps researchers understand immune changes and may support future diagnosis or treatments.
Los Angeles, CaliforniaAges 19 years+ - NCT03223090Recruiting
Motor language learning study for French speakers
This study tests how people learn language using brain-and-movement training (including tasks during brain scans and non-drug brain stimulation for some parts). It may help researchers understand learning and how the brain adapts during new language practice.
BronAges 20–40 - NCT02821806Recruiting
Donate blood cells to help grow immune cells for therapy
This is a study that recruits healthy adults to donate a type of blood cell (PBMCs) so researchers can grow T cells for future adoptive cell therapy. It tests a process for collecting and expanding immune cells; participation mainly involves blood donation and health screening.
Bethesda, MarylandAges 18–120 - NCT02740868RecruitingPhase 2
Breathing MRI using xenon gas to study lungs
This trial uses a special breathing MRI (you breathe a gas mixture) to measure how well your lungs work. It studies healthy kids and people with lung conditions like cystic fibrosis or asthma, and it may help researchers better understand lung function and flare-ups.
Toronto, OntarioAges 8 years+ - NCT02851043Recruiting
Non-invasive monitor to measure breathing
This study tests a device that checks breathing without needles or painful procedures. It may help doctors learn how well breathing can be measured in people with mild breathing problems, or in healthy volunteers.
Wilmington, DelawareAges 11–17 - NCT02543983RecruitingPhase 2
Brain scan and ketamine study for suicidal thoughts
This trial studies how ketamine affects the brain in people dealing with suicidal thoughts or an active suicide crisis. It uses questionnaires, consent testing, and brain imaging to look for biological changes that may relate to symptom improvement.
Bethesda, MarylandAges 18–70 - NCT02327884Recruiting
Study saliva and related diseases to learn health patterns
This study looks at diseases that involve the salivary (saliva) glands, and may also include people with active hepatitis, oral cancer, or healthy adults. Researchers collect blood, urine, saliva, and sometimes tissue to better understand what’s happening and how these conditions relate to saliva and oral health.
Bethesda, MarylandAges 4–100
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Common questions
- Are there clinical trials for volunteers?
- Yes. Clin2 currently lists 526 recruiting volunteers 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 volunteers 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 volunteers 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.