Clinical trials
General Population (no Specific Condition or Disease) clinical trials
Below are recruiting general population (no specific condition or disease) clinical trials, each written for real people, not researchers. We’re tracking 10,802 recruiting studies, each written for real people, not researchers, below.
Recruiting studies
- NCT04715568RecruitingPhase 4
Testing how smoke exposure affects heart health
This study looks at whether being exposed to secondhand tobacco smoke at work affects heart and blood vessel health. It may help researchers understand which people are at higher risk and how the body responds to that exposure.
San Francisco, CaliforniaAges 40 years+ - NCT04715984Recruiting
Testing brain-circuit targets during DBS surgery in Parkinson’s
This study looks at how brain connections involved in movement may relate to thinking and memory problems in Parkinson’s disease. It happens during a deep brain stimulation (DBS) operation, using tests while the surgeon is placing an electrode.
Nashville, TennesseeAges 40 years+ - NCT04720560Recruiting
Study how immune cells affect fatty liver disease
This study looks at how certain immune cells (“regulatory B cells”) may contribute to metabolic fatty liver disease. You might be able to join if you’re an adult with fatty liver but not pregnant and not on certain treatments.
AsyutAges 18–80 - NCT04722029RecruitingPhase 1/Phase 2
Donor immune-cell therapy for stubborn adenovirus infections
This study tests whether specially matched donor T-cells can control “refractory” adenovirus (a virus) that isn’t responding to usual antiviral medicines. It may help if the infection keeps coming back or is already affecting organs like the lungs or bowel.
Columbus, OhioAges Up to 60 years - NCT04724941Recruiting
Screening for alpha-synuclein in early Parkinson’s risk
This study looks for changes in a protein called alpha-synuclein in people who may be in the early “prodromal” stage before Parkinson’s symptoms fully appear. It may help researchers find early markers and understand who is more likely to develop Parkinson’s disease.
KielAges 50–99 - NCT04731246Recruiting
Eye-movement testing in people with early Parkinson’s
This study uses video recordings of your eye movements to learn more about Parkinson’s disease. It may help researchers better tell Parkinson’s apart from other movement conditions and understand how the disease affects the brain early on.
MonacoAges 18 years+ - NCT04735627Recruiting
Real-time monitoring of levodopa levels in Parkinson’s
This study checks whether measuring levodopa (a Parkinson medicine) in real time can help better understand Parkinson medication effects. You may be asked to wear/perform study monitoring while taking your usual carbidopa/levodopa tablets.
San Diego, CaliforniaAges 40–85 - NCT04740541Recruiting
Diet study for adult men with Crohn’s disease
This study looks at how a specific amino-acid (threonine) diet affects adults with Crohn’s disease and signs of intestinal inflammation. It may help researchers understand what dietary protein needs could support more stable disease.
Toronto, OntarioAges 18–49 - NCT04740580RecruitingEarly Phase 1
Test glutathione for brain inflammation in Alzheimer’s
This early-stage study tests whether taking glutathione can affect brain “inflammation” and metabolism in people with Alzheimer’s disease. You might benefit from a new treatment approach, while helping researchers understand what works best for early Alzheimer’s-related brain changes.
Houston, TexasAges 55–85 - NCT04741646RecruitingPhase 2
Ferric citrate for kids with chronic kidney disease
This Phase 2 study tests ferric citrate, a medicine that helps control phosphate and iron balance, in children with chronic kidney disease. It may help slow problems related to kidney disease by improving lab measures like phosphate levels.
Los Angeles, CaliforniaAges 6–18 - NCT04744116RecruitingEarly Phase 1
Cord blood cell therapy added to ruxolitinib for steroid-resistant GVHD
This trial studies whether adding cord-blood–derived cells to ruxolitinib can improve steroid-resistant acute graft-versus-host disease (GVHD) affecting the lower gut or liver. It’s meant for people who are not getting better (or are worsening) despite adequate steroid treatment.
Houston, TexasAges 12–80 - NCT04749927Recruiting
Image-based eye photos to study heart blood-vessel risks
This study uses deep learning (computer pattern recognition) to analyze retinal photos (pictures of the eye’s blood vessels). It aims to link what’s seen in the eye to heart and blood-vessel disease patterns, especially in people with higher cardiovascular risk.
SeoulAges 20–79 - NCT04752293Recruiting
Study of a kidney blood-pressure system in kids
This study looks at how a kidney-related blood-pressure system works in children and teenagers, comparing those with newly diagnosed primary (no known cause) high blood pressure to those with normal blood pressure. It may help doctors better understand childhood blood-pressure changes and guide future care.
Winston-Salem, North CarolinaAges 7–18 - NCT04760964Recruiting
Testing blood markers in active Crohn’s and ulcerative colitis
This study looks for specific body signals (called mitochondrial “DAMPs”) that may reflect active inflammation in Crohn’s disease and ulcerative colitis. It also checks how these markers relate to what doctors see during colonoscopy or flexible scope exams, to help understand inflammation and potentially guide future care.
DundeeAges Any age - NCT04761991Recruiting
CMR vs CT scan for coronary artery disease
This study compares two heart-imaging tests—cardiac MRI (CMR) and CT—to see which better helps evaluate coronary artery disease in people with chest pain. You may be asked to have one of these scans as part of your heart work-up.
Leicester, LeicsAges 18 years+ - NCT04770584Recruiting
Fear and avoidance study in PTSD and healthy volunteers
This study looks at how people with current PTSD—or people without PTSD—respond to fear and avoiding things they might find threatening. It may help researchers understand these patterns and how they differ after trauma.
Houston, TexasAges 18–70 - NCT04772768Recruiting
Checking problems in vein bypass grafts in people with recurring chest pain
This study looks at how vein bypass grafts are working over time in people who had heart bypass surgery and now have recurring angina (chest discomfort). It may help doctors better understand why symptoms come back and how the heart and grafts change.
AmsterdamAges 18–90 - NCT04774536RecruitingPhase 1/Phase 2
CRISPR gene-edited bone marrow transplant for severe sickle cell
This Phase 1/2 study tests a CRISPR-edited bone marrow (stem cell) transplant to treat severe sickle cell disease. It aims to reduce dangerous sickle-related complications by changing the patient’s stem cells before transplant.
Los Angeles, CaliforniaAges 12–35 - NCT04775537Recruiting
OssiMend bone graft for lumbar spine fusion surgery
This trial studies whether OssiMend bone graft helps heal a lumbar spine fusion for people whose disc disease has not improved with non-surgical care. It may be an option if you need back surgery due to specific spine wear-and-tear changes.
Encinitas, CaliforniaAges 18 years+ - NCT04779320RecruitingPhase 3
Vedolizumab for teens with moderate to severe Crohn's
This trial tests vedolizumab to treat children and teens with moderate to severe Crohn’s disease when standard treatments haven’t worked or caused side effects. It may help reduce gut inflammation and symptoms and help some patients stay healthier over time.
Phoenix, ArizonaAges 2–17 - NCT04782232Recruiting
Study of a new blood tube for heart pump patients
This registry study checks whether a new venous blood tube used with a heart pump is safe and practical for people whose right heart is failing and who may need a heart transplant. If you qualify, your care team would monitor how the device works over time.
MunichAges Any age - NCT04784364Recruiting
Study of immune treatments at Mount Sinai
This study follows people who are receiving immune-related medications (called biologics or immune modulators) at Mount Sinai. It aims to better understand how these treatments affect the immune system and health over time, which may help improve future care.
New York, New YorkAges 12 years+ - NCT04800484Recruiting
Test how different AFO heel height and stiffness affect walking
This study looks at how changing the heel height and stiffness of an AFO (a brace you wear on your lower leg/foot) changes your walking pattern. The goal is to learn which brace settings may improve comfort and walking.
Iowa City, IowaAges 18–70 - NCT04800588Recruiting
Computer tests to study early Alzheimer’s changes
This study uses computer and touch-screen tasks to measure thinking changes in people who may be in the early, symptom-free stage of Alzheimer’s disease. It aims to understand how these brain-related changes show up on testing, which could help future detection or tracking.
Berkeley, CaliforniaAges 18–89
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Common questions
- Are there clinical trials for general population (no specific condition or disease)?
- Yes. Clin2 currently lists 10,802 recruiting general population (no specific condition or disease) 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 general population (no specific condition or disease) 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 general population (no specific condition or disease) 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.