To join a healthy clinical trial in United States, select a recruiting trial below and check the eligibility criteria. Contact the trial's principal investigator or the listed site in United States directly. All trials listed here are sourced from ClinicalTrials.gov, the official U.S. registry of clinical studies.

What phases are healthy trials in United States?

Active healthy trials in United States span Phase 1, Phase 3, Phase 2. Phase I trials test safety, Phase II test efficacy, and Phase III compare against standard treatments in larger patient populations.

Browse More

All United States Trials → Global healthy Trials → All Countries → All Trials →

ClinicalMetric — Independent clinical trial intelligence platform. Not affiliated with NIH, ClinicalTrials.gov, the U.S. FDA, or any pharmaceutical company, hospital, or clinical research organization. Trial data is sourced from ClinicalTrials.gov for informational purposes only and does not constitute medical advice. Do not make any treatment, enrollment, or health decisions based solely on information found here — always consult a qualified healthcare professional. Full Disclaimer · Last Reviewed: September 2026 · Data Methodology

Active Trials in United States (31)

Telemedicine to Support Living Kidney Donor Candidates

Evaluation of [11C]ZTP-1 to Image PDE4B

Identification of Biomarkers for Stress Vulnerability and Resilience

BEATRIX: A Study to Learn About a Group B Streptococcus Vaccine in Healthy Pregnant Women and Their Babies

Electrophysiological Source Imaging Guided Transcranial Focused Ultrasound

Predicting Future Errors During Skill Performance

Multifocal HD-tDCS and Motor Function

Alternation in the Human Microbiome With Commonly Used Topical Medications

Intraoperative OCT Guidance of Intraocular Surgery II

The BrainHealth Project

Effectiveness of Aquamin® in Mitigating Halitosis

Adversity, Brain and Opioid Use Study

A Study to Evaluate Safety, Tolerability, and Immunogenicity of V350A and V350B in Healthy Participants (V350-001).

Digital Measures for Clinical Trial Endpoints in Huntington's Disease

Evaluation of the Potential of Grape Consumption to Improve Muscle Strength and Cognitive Function

Blood Collection for COM/BSBS

Spatial Cues, Task Demands, and Auditory Selective Attention

Neuromodulation of Brain and Emotional Responses to Psychological Stress

Evaluate the Effects of Citicoline on Mood in Healthy Adults

Filgrastim-Mobilized Stem Cells for Transplantation Using Unrelated Donors

A Study to Evaluate Breathing Muscle Training in Cardiac Rehab

A Study to Learn How the Body Processes the Study Medicine PF-07328948 in People With Reduced Kidney Function

Impact of Phenylalanine Elevations on Brain and Cognition in Adult PKU Carriers

SV2 PET Imaging With [11C]APP311

Glowing and Expecting Follow Up

Medical Illustration Design Characteristic Evaluation

New Orleans Pulmonary Hypertension Biobank

A Study to Learn How Different Forms of the Study Medicine Called PF-08049820 Are Absorbed and Eliminated in Healthy Adults

Evaluating Q-Collar Effects on Brain Blood Flow Control During Exercise

A Study of Mirikizumab Solution (LY3074828) in Healthy Participants

Gamma Oscillations as a Prognostic Marker for Ketamine Therapy in Treatment Resistant Depression

Frequently Asked Questions