Who can join
Studies open only to men
These studies list male participants only in their official record. Most other studies accept everyone regardless of sex.
117 recruiting studiesSource: ClinicalTrials.gov, refreshed October 26, 2026How we list studies
Studies
- RecruitingHealthy volunteers
Sexual Health Advocacy for Guys - a Text Messaging-based HIV Prevention Program for Guys Who Are Into Guys
Center for Innovative Public Health Research
- Location
- San Clemente, CA
- Eligibility basics
- Ages 13–22 · Men only
- RecruitingHealthy volunteers
MyPEEPS Mobile Plus: A Multi-Level HIV Prevention Intervention for Young MSM
Columbia University
- Location
- New York, NY
- Eligibility basics
- Ages 16–25 · Men only
- RecruitingHealthy volunteers
University of Pittsburgh Brain Health Initiative
David Okonkwo, MD, PhD
- Location
- Pittsburgh, PA
- Eligibility basics
- Ages 29–59 · Men only
- RecruitingHealthy volunteersPhase 2
Enfortumab Vedotin for the Treatment of Patients With Metastatic or Unresectable Squamous Cell Carcinoma of the Penis
Mayo Clinic
- Location
- Phoenix, AZ + 2 other US sites
- Eligibility basics
- Ages 18+ · Men only
- RecruitingHealthy volunteers
Wearable Technology to Evaluate Hyperglycemia and HRV in DMD
Vanderbilt University Medical Center
- Location
- Nashville, TN
- Eligibility basics
- Ages 10+ · Men only
- RecruitingHealthy volunteers
The Collaborative Care PrTNER Study
Children's Hospital of Philadelphia
- Location
- Philadelphia, PA
- Eligibility basics
- Ages 15–29 · Men only
- RecruitingHealthy volunteers
Prostate Cancer Screening for People at Genetic Risk for Aggressive Disease, PATROL Study
University of Washington
- Location
- Duarte, CA + 6 other US sites
- Eligibility basics
- Ages 40+ · Men only
- RecruitingHealthy volunteers
Extending Prostate Genetic Awareness, Navigation, and Delivery: The EXPAND Network
Thomas Jefferson University
- Location
- Philadelphia, PA
- Eligibility basics
- Ages 18+ · Men only
- RecruitingHealthy volunteersPhase 4
Got Doxy- 'Flipping the Script' on STI PEP
Emory University
- Location
- Atlanta, GA + 1 other US site
- Eligibility basics
- Ages 18+ · Men only
- RecruitingHealthy volunteers
Imaging Cannabinoid Receptors Using Positron Emission Tomography (PET) Scanning
Yale University
- Location
- New Haven, CT
- Eligibility basics
- Ages 18–55 · Men only
- RecruitingHealthy volunteers
Finishing HIV Project
University of Miami
- Location
- Miami, FL
- Eligibility basics
- Ages 18–54 · Men only
- RecruitingHealthy volunteers
Cleveland African American Prostate Cancer Project
Case Comprehensive Cancer Center
- Location
- Cleveland, OH
- Eligibility basics
- Ages 40+ · Men only
- RecruitingHealthy volunteers
California MEPS Hub
University of California, Los Angeles
- Location
- Oakland, CA + 2 other US sites
- Eligibility basics
- Ages 18–59 · Men only
- RecruitingHealthy volunteers
A Regional Partnership to Improve Outcomes Through Fatherhood Engagement
Montefiore Medical Center
- Location
- The Bronx, NY
- Eligibility basics
- Ages 18+ · Men only
- RecruitingHealthy volunteers
MyPEEPS LITE Trial
Columbia University
- Location
- Chicago, IL + 1 other US site
- Eligibility basics
- Ages 16–29 · Men only
- RecruitingHealthy volunteers
Effect of Dietary Nitrate on Immobilization-induced Changes in Skeletal Muscle in Young Healthy Men
Indiana University
- Location
- Indianapolis, IN
- Eligibility basics
- Ages 18–44 · Men only
- RecruitingHealthy volunteers
Chardonnay Marc and Vascular Response
University of California, Davis
- Location
- Davis, CA
- Eligibility basics
- Ages 30–50 · Men only
- RecruitingHealthy volunteersPhase 2
Fiber and Calcium Absorption in Older Men
VA Office of Research and Development
- Location
- San Francisco, CA
- Eligibility basics
- Ages 60+ · Men only
- RecruitingHealthy volunteersPhase 2
Bipolar Androgen Therapy (BAT) and Radium-223 (RAD) in Metastatic Castration-resistant Prostate Cancer (mCRPC)
Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins
- Location
- Baltimore, MD
- Eligibility basics
- Ages 18+ · Men only
- RecruitingHealthy volunteersPhase 4
Self-Adjusted Nitrous Oxide: A Feasibility Study in the Setting of Vasectomy
Beth Israel Deaconess Medical Center
- Location
- Boston, MA
- Eligibility basics
- Ages 21–85 · Men only
- RecruitingHealthy volunteers
A Randomized Controlled Trial of Digital CBT to Treat Addiction: Digital RITch®CBT vs. Standard CBT
University of Rochester
- Location
- Rochester, NY
- Eligibility basics
- Ages 18–65 · Men only
- RecruitingHealthy volunteers
The Prostate Cancer, Genetic Risk, and Equitable Screening Study (ProGRESS)
VA Office of Research and Development
- Location
- Boston, MA
- Eligibility basics
- Ages 55–69 · Men only
- RecruitingHealthy volunteersPhase 2
Randomized Phase II Trial of Targeted Radiation With no Castration for Mcrpc
VA Office of Research and Development
- Location
- West Los Angeles, CA + 3 other US sites
- Eligibility basics
- Ages 18+ · Men only
- RecruitingHealthy volunteersPhase 2
Progesterone in Gender Affirming Hormone Therapy Study
Emory University
- Location
- Atlanta, GA
- Eligibility basics
- Ages 18–60 · Men only
Questions
If I fit this group, will I qualify?
Not necessarily. Age and sex limits are only the first filter. Each study has its own inclusion and exclusion criteria, and the research team decides at screening.
Where do these age and sex limits come from?
From the eligibility section of each study’s official ClinicalTrials.gov record. We don’t infer eligibility from anything else.