Volunteer Clinical Trials

353 recruitingLast updated: May 13, 2026

There are 353 actively recruiting volunteer clinical trials across 47 countries. Studies span Phase 1, Not Applicable, Phase 2, Early Phase 1, Phase 3, Phase 4. Top locations include Bethesda, Maryland, United States, Baltimore, Maryland, United States, Grayslake, Illinois, United States. Updated daily from ClinicalTrials.gov.


Volunteer Trials at a Glance

353 actively recruiting trials for volunteer are listed on ClinicalTrialsFinder across 6 cities in 47 countries. The largest study group is Phase 1 with 165 trials, with the heaviest enrollment activity in Bethesda, Baltimore, and Grayslake. Lead sponsors running volunteer studies include AbbVie, Bristol-Myers Squibb, and Centre Hospitalier Universitaire de Saint Etienne.

Treatments under study

About Volunteer Clinical Trials

Looking for clinical trials for Volunteer? There are currently 2 studies actively recruiting participants. Clinical trials offer access to new treatments before they are widely available, and every approved therapy in use today was first tested through a clinical trial.

Below you can browse trials, sign up for alerts when new Volunteer trials open, and view eligibility criteria for each study. Each listing includes the study phase, locations, and enrollment details.

Frequently Asked Questions

Common questions about Volunteer clinical trials

A clinical trial is a carefully designed research study that tests new medical treatments, drugs, devices, or approaches in human volunteers. Every approved medication and treatment available today was proven safe and effective through clinical trials.

All clinical trials are reviewed and approved by Institutional Review Boards (IRBs) — independent committees that evaluate patient safety. Trials follow strict protocols, and your health is monitored closely throughout. You can withdraw at any time.

Not necessarily. Many trials compare the new treatment against the current standard of care, meaning all participants receive active treatment. When placebos are used, they are typically combined with standard treatment, not given alone. The trial description will always specify the design.

Under the Affordable Care Act, most private insurers are required to cover routine patient care costs during a clinical trial. The sponsor typically covers the investigational treatment itself. Medicare also covers routine costs for qualifying trials.

Yes. Participation is completely voluntary. You can withdraw at any time, for any reason, without it affecting your access to standard medical care.

Each trial has specific eligibility criteria — including age, diagnosis, disease stage, prior treatments, and general health. Browse the trials listed above and check their eligibility sections. You can also contact the trial site directly to discuss your situation.

Showing 120 of 353 trials

Recruiting
Phase 2

Early Metabolic Effects of Antiretroviral Drugs in Healthy volUnteers: a Phase 2 Randomized Study

Weight GainHealthy VolunteerMetabolic Effects+1 more
National Institute of Allergy and Infectious Diseases (NIAID)120 enrolled1 locationNCT05652478
Recruiting
Not Applicable

New Heart Imaging Techniques to Evaluate Possible Heart Disease

ObesityHealthyDiabetes+2 more
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)4,000 enrolled1 locationNCT01399385
Recruiting

Physical and Behavioral Traits of Overweight and Obese Adults

ObesityHealthy Volunteers
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)2,000 enrolled1 locationNCT00428987
Recruiting
Not Applicable

The Effects of Increasing Caloric Intake on Diet-Induced Thermogenesis and 24h Energy Expenditure

ObesityHealthy VolunteersNormal Physiology
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)120 enrolled1 locationNCT05545306
Recruiting
Not Applicable

Variability In Mixed Meal Tests: Fixed Versus Adjusted to Energy Needs Caloric Dose

ObesityHealthy Volunteer
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)79 enrolled1 locationNCT06223555
Recruiting

Genetic and Epigenetic Signatures of Translational Aging Laboratory Testing (GESTALT)

Healthy VolunteersFrailNon-Healthy/Non-Frail
National Institute on Aging (NIA)900 enrolled1 locationNCT02339012
Recruiting
Not Applicable

Effects of Urolithin A Supplementation on Glucose Metabolism in Healthy Adults 55 >= Years Old: A Randomized Triple-Masked Controlled Clinical Trial

Healthy Volunteer
National Institute on Aging (NIA)180 enrolled1 locationNCT06274749
Recruiting

Vaccine Responses to SARS-CoV-2 and Other Emerging Infectious Diseases

Healthy VolunteerCOVID-19Vaccination
National Institute of Allergy and Infectious Diseases (NIAID)1,200 enrolled1 locationNCT05078905
Recruiting

Characterization of Diseases With Salivary Gland Involvement

Healthy VolunteerSjogren's SyndromeSalivary Gland Disease
National Institute of Dental and Craniofacial Research (NIDCR)1,150 enrolled1 locationNCT02327884
Recruiting

Normal Values in Hearing and Balance Testing

Healthy Volunteer
National Institute on Deafness and Other Communication Disorders (NIDCD)500 enrolled1 locationNCT01629108
Recruiting
Not Applicable

Artificial Intelligence Delivered Cardiac Magnetic Resonance - Prospective Validation

Cardiovascular DiseasesHealthy Volunteers
Imperial College London150 enrolled1 locationNCT06061822
Recruiting
Phase 1

A Study of Multiple Doses of Orally Administered RO7795081 in Otherwise Healthy Chinese Adult Participants With Obesity or Overweight

Healthy VolunteersOverweight or Obesity
Hoffmann-La Roche30 enrolled2 locationsNCT07499050
Recruiting

Oral Bacteria and Immune System Problems Involved in Gum Disease (Periodontitis)

Healthy VolunteerImmunosuppressionPeriodontal Disease+1 more
National Institute of Dental and Craniofacial Research (NIDCR)700 enrolled1 locationNCT01568697
Recruiting

A Longitudinal Study of Epstein-Barr Virus (EBV) Reactivation in Adults Aged 18 to 29 Years

Healthy VolunteersEpstein-Barr Virus (EBV)
Sanofi Pasteur, a Sanofi Company100 enrolled1 locationNCT07536048
Recruiting
Phase 1Phase 2

Study of ABS-201 Evaluating Single and Multiple Ascending Doses in Healthy Adults With and Without Androgenetic Alopecia

Androgenetic alopecia (AGA)Healthy Volunteers - Male and Female
Absci Pty Ltd.227 enrolled4 locationsNCT07317544
Recruiting
Phase 1

A Trial to Examine the Interaction of Repinatrabit With Ethinyl Estradiol/Norethindrone, Metformin,Carbamazepine, Rosuvastatin, and Methotrexate When Administered Together

Healthy Volunteers
Otsuka Pharmaceutical Development & Commercialization, Inc.48 enrolled1 locationNCT07446400
Recruiting
Not Applicable

Generalization and Specificity of Visual Learning During Sleep

Healthy VolunteersVisual Learning
Brown University10 enrolled1 locationNCT07015840
Recruiting

Neural Bases of Decision-making in Healthy Individuals

Healthy Volunteers
Istituti Clinici Scientifici Maugeri SpA150 enrolled1 locationNCT05774834
Recruiting

Neural Bases of Social Cognitive Processing in Healthy Individuals

Healthy Volunteers
Istituti Clinici Scientifici Maugeri SpA200 enrolled1 locationNCT05774860
Recruiting

Unconscious Processing in Decision-making

Healthy Volunteers
Istituti Clinici Scientifici Maugeri SpA200 enrolled1 locationNCT05774847