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7,114 recruiting studies with US sites, from the official ClinicalTrials.gov registry (refreshed Oct 28, 2026). No sign-up needed.
Most recently updated studies · page 30 of 297
- RecruitingHealthy volunteers
GUT-FEELINGS: Using Citizen Science for Large-Scale Prebiotic Clinical Trials for Mental Wellness in Adults
Holobiome, Inc.
- Location
- Del Mar, CA
- Eligibility basics
- Ages 21–80
- RecruitingHealthy volunteers
Scaling Effective Behavioral Interventions With MPC Avatar-Based Virtual Training
dfusion Inc
- Location
- Scotts Valley, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteersPhase 2
A Study Assessing Safety, Tolerability, and Efficacy of INNA-051 in Preventing Respiratory Illness Due to Viral Infections in Healthy Adults 18 to 45 Years of Age
ENA Respiratory Pty Ltd
- Location
- Baltimore, MD + 5 other US sites
- Eligibility basics
- Ages 18–45
- RecruitingHealthy volunteers
Safety and Tolerability Evaluation of IgG Binding Protein LT
Bactolife A/S
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 18–70
- RecruitingHealthy volunteersPhase 4
Study to Assess Safety and Tolerability of KarXT With Administration of Antiemetics in Healthy Volunteers
Karuna Therapeutics, Inc., a Bristol Myers Squibb company
- Location
- Los Alamitos, CA + 3 other US sites
- Eligibility basics
- Ages 18–65
- RecruitingHealthy volunteersPhase 4
Study of a Recombinant Spike COVID-19 Vaccine With Matrix-M in Older Adults and People at Increased Risk of Severe COVID-19
Sanofi
- Location
- Fair Oaks, CA + 19 other US sites
- Eligibility basics
- Ages 12+
- RecruitingHealthy volunteers
A Clinical Trial to Evaluate the Effects of the Kaia Relief - Cycle System on Premenstrual Symptom Severity, Menstrual Discomfort, and Overall Well-Being in Premenopausal Women.
Vivance Group
- Location
- Las Vegas, NV
- Eligibility basics
- Ages 18–45 · Women only
- RecruitingHealthy volunteersPhase 3
A Phase 3 Study of Revaccination in Subsequent Pregnancies With Bivalent RSV Vaccine and Duration of Protection of a Single Dose
Pfizer
- Location
- Birmingham, AL + 76 other US sites
- Eligibility basics
- Ages 0 mo+
- RecruitingHealthy volunteers
Acquisition and Clinical Image Evaluation of Fujifilm's High Resolution (HR) Digital Breast Tomosynthesis (DBT) Images.
Fujifilm Medical Systems USA, Inc.
- Location
- Salt Lake City, UT
- Eligibility basics
- Ages 40+ · Women only
- RecruitingHealthy volunteersPhase 3
A Study to Assess the Safety, Tolerability, and Immunogenicity of 3 Lots of a Multivalent Pneumococcal Conjugate Vaccine Administered to Adults
Pfizer
- Location
- Birmingham, AL + 36 other US sites
- Eligibility basics
- Ages 18–49
- RecruitingHealthy volunteersPhase 3
A Study to Learn About a Clostridioides Difficile Vaccine in People 65 Years of Age and Older
Pfizer
- Location
- Athens, AL + 138 other US sites
- Eligibility basics
- Ages 65+
- RecruitingHealthy volunteers
Driving Time and Facial Skin Hydration Asymmetry in Florida Drivers
IAS Skin Care
- Location
- Orlando, FL
- Eligibility basics
- Ages 25–65 · Women only
- RecruitingHealthy volunteers
Clinical Evaluation of a Multi-functional Beauty Device on Cosmetic Skin Outcomes
APR Co., Ltd.
- Location
- Baltimore, MD
- Eligibility basics
- Ages 30–65
- RecruitingHealthy volunteersPhase 3
A Study to Evaluate the Immune Response and Safety of a Vaccine Against Influenza in Adults 18-64 Years of Age
GlaxoSmithKline
- Location
- Glendale, AZ + 11 other US sites
- Eligibility basics
- Ages 18–64
- RecruitingHealthy volunteers
Contraceptive Efficacy Study of Ovaprene
Daré Bioscience, Inc.
- Location
- Phoenix, AZ + 3 other US sites
- Eligibility basics
- Ages 18–40 · Women only
- RecruitingHealthy volunteers
Effect of a Dietary Supplement Versus Placebo on Serum PFAS Levels in Male Firefighters
Cambiotics ApS
- Location
- Chicago, IL
- Eligibility basics
- Ages 18+ · Men only
- RecruitingHealthy volunteers
Observational Assessment of Skin Appearance Changes During PRX S Cosmetic Treatment in Participants With Acne-Prone Skin
WiQo S.p.A.
- Location
- Leawood, KS + 1 other US site
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteersPhase 3
Fertilo In Vitro Research Study and Trial
Gameto, Inc.
- Location
- Clovis, CA + 15 other US sites
- Eligibility basics
- Ages 18–35 · Women only
- RecruitingHealthy volunteers
BoxX-NoAF Clinical Trial
AtriCure, Inc.
- Location
- Scottsdale, AZ + 30 other US sites
- Eligibility basics
- Ages 65+
- RecruitingHealthy volunteers
A Study to Assess the Efficacy of an Experimental Mouthwash Used With a Marketed Whitening Toothpaste on Stain Build-up
HALEON
- Location
- Melbourne, FL
- Eligibility basics
- Ages 18–65
- RecruitingHealthy volunteers
Integration of the Oura Ring and Maven Clinic Among Women Who Are Trying to Conceive
Ouraring Inc.
- Location
- New York, NY
- Eligibility basics
- Ages 18–45 · Women only
- RecruitingHealthy volunteers
ProACT Post-Approval Study
Uromedica
- Location
- Los Angeles, CA + 13 other US sites
- Eligibility basics
- Ages 50+ · Men only
- RecruitingHealthy volunteers
Comparative Study of the Tomey FT-1000, and Goldmann Applanation Tonometer (GAT)
Tomey Corporation
- Location
- Jacksonville, FL
- Eligibility basics
- Ages 22+
- RecruitingHealthy volunteers
A Study to Test the Repeatability and Reproducibility in Rod Intercept Time Within the AdaptDx Pro in Healthy Subjects With Normal Vision (FlashForward)
AdaptDx, Inc.
- Location
- Silverdale, WA
- Eligibility basics
- Ages 22–49
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