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 volunteersPhase 1Overnight stay mentioned
A Study to Learn How ASP3082 is Processed in Healthy Men
Astellas Pharma Global Development, Inc.
- Location
- Madison, WI
- Eligibility basics
- Ages 18–65 · Men only
- RecruitingHealthy volunteersPhase 1
A Phase 1 Relative Bioavailability Study of a VX-581 Tablet Formulation
Vertex Pharmaceuticals Incorporated
- Location
- Tempe, AZ
- Eligibility basics
- Ages 18–55 · Men only
- RecruitingHealthy volunteersPhase 1
Evaluate the Effect of Vimseltinib on P-glycoprotein (P-gp) Inhibition in Healthy Male Participants
Deciphera Pharmaceuticals, LLC
- Location
- Overland Park, KS
- Eligibility basics
- Ages 18–55 · Men only
- RecruitingHealthy volunteersPhase 1
A Research Study Looking at How Different Doses of Study Medicine (Inno8) Work in the Body of People With Haemophilia A
Novo Nordisk A/S
- Location
- Aurora, CO + 4 other US sites
- Eligibility basics
- Ages 18–64 · Men only
- RecruitingHealthy volunteersPhase 1
A Study to Evaluate the Effect of Food on the Bioavailability of AJ201, and Safety, Tolerability, and Pharmacokinetics of AJ201 in Japanese and White Healthy Male Participants
AnnJi Pharmaceutical Co., Ltd.
- Location
- Los Alamitos, CA
- Eligibility basics
- Ages 18–55 · Men only
- RecruitingHealthy volunteersPhase 1
Study of MAR002 in Healthy Men
Marea Therapeutics
- Location
- Tempe, AZ
- Eligibility basics
- Ages 18–40 · Men only
- RecruitingHealthy volunteersPhase 1
The Objective of This Phase 1 Study is to Evaluate the Food Effect of 100 mg Hezkue Turbo® (ASP-001.1, Sildenafil) Under Fed Versus 100 mg of Hezkue Turbo® (ASP-001.1, Sildenafil) Under Fasted Conditions in Healthy…
Aspargo Labs, Inc
- Location
- New York, NY
- Eligibility basics
- Ages 20–70 · Men only
- RecruitingHealthy volunteersPhase 1/Phase 2
Spermatogonial Differentiation Via Testicular Organoid
CellARTs Inc.
- Location
- San Francisco, CA
- Eligibility basics
- Ages 18–60 · Men only
- RecruitingHealthy volunteersEarly Phase 1
Testosterone and Neural Function in Men With Spinal Cord Injury
VA Office of Research and Development
- Location
- The Bronx, NY
- Eligibility basics
- Ages 18–80 · Men only
- RecruitingHealthy volunteersEarly Phase 1
rhPSMA-73 PET-MRI Imaging for the Detection of Prostate Cancer Among Men Who Are Otherwise Candidates for Active Surveillance
Northwestern University
- Location
- Chicago, IL
- Eligibility basics
- Ages 18+ · Men only
- RecruitingHealthy volunteersPhase 1/Phase 2
Post-operative Urinary Retention (POUR) Following Thoracic Surgery
Hackensack Meridian Health
- Location
- Hackensack, NJ
- Eligibility basics
- Ages 50+ · Men 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
ProACT Post-Approval Study
Uromedica
- Location
- Los Angeles, CA + 13 other US sites
- Eligibility basics
- Ages 50+ · Men only
- RecruitingHealthy volunteers
Efficacy of Qualia Testosterone+ on Testosterone Levels in Adult Males
Qualia Life Sciences
- Location
- Carlsbad, CA
- Eligibility basics
- Ages 28–65 · Men only
- RecruitingHealthy volunteers
The Effects of Tyrosol and Creatine on Exercise Performance and Cognition in Healthy Adults
Applied Science & Performance Institute
- Location
- Tampa, FL
- Eligibility basics
- Ages 20–55 · Men only
- RecruitingHealthy volunteers
Effects of Eggshell Membrane and Curcumin Extract Supplementation, Separately or Combined, on Recovery From Intense Exercise
ESM Technologies, LLC
- Location
- College Station, TX
- Eligibility basics
- Ages 18–40 · Men only
- RecruitingHealthy volunteers
Intervention to Help Orient Men to Excel (IN-HOME) Phase II Study
KDH Research & Communication
- Location
- Atlanta, GA
- Eligibility basics
- Ages 18+ · Men only
- RecruitingHealthy volunteers
Pornography Abstinence and Nocturnal Erections in Adult Men
Efforia, Inc
- Location
- New York, NY
- Eligibility basics
- Ages 18+ · Men only
- RecruitingHealthy volunteersPhase 2
Effects of NLS-133, a Potential Non-Hormonal "On-Demand" Male Contraceptive
Next Life Sciences
- Location
- Seattle, WA
- Eligibility basics
- Ages 18–55 · Men only
- RecruitingHealthy volunteers
Prospective Study on Power Prenatal Vitamins for Males on YO Score At-home Sperm Test Results
The Bird and Be Co Inc
- Location
- Encino, CA
- Eligibility basics
- Ages 18–50 · Men only
- RecruitingPhase 2/Phase 3
Phase 2/3 Efficacy and Safety of PP405 in Adult Males
Pelage Pharmaceuticals, Inc.
- Location
- Birmingham, AL + 26 other US sites
- Eligibility basics
- Ages 18–55 · Men only
- RecruitingPhase 1/Phase 2
A Study to Investigate the Safety and Effectiveness of a Coagulation Factor IX Gene Insertion Therapy (REGV131-LNP1265) in Pediatric, Adolescent and Adult Participants With Hemophilia B
Regeneron Pharmaceuticals
- Location
- Phoenix, AZ + 16 other US sites
- Eligibility basics
- Ages 2+ · Men only
- RecruitingPhase 1
A Study in Adult Males With X-linked Congenital Nephrogenic Diabetes Insipidus to Test the Effects of NDI-5001 Given for Multiple Days and to Test How NDI-5001 is Tolerated and Taken up in the Body
Otsuka Pharmaceutical Development & Commercialization, Inc.
- Location
- Jacksonville, FL + 1 other US site
- Eligibility basics
- Ages 18–55 · Men only
- Recruiting
To Establish the Safety and Effectiveness of the ALPFA GRAIL PFA System for Treating Symptomatic Benign Prostate Hyperplasia (BPH) Also Known as an Enlarged Prostate.
ALPFA Medical
- Location
- Germantown, TN
- Eligibility basics
- Ages 45+ · 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.