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Showing 25–48 of 24 matching trials from the live ClinicalTrials.gov search.
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Recruiting Not applicable Interventional Accepts healthy volunteers

Effect of Dietary Nitrate on Immobilization-induced Changes in Skeletal Muscle in Young Healthy Men

NCT07161973
View directory record Official record
Conditions
Mitochondrial Energetics, Dietary Nitrate, Disuse Atrophy (Muscle) of Lower Leg
Interventions
Beetroot Juice - Active, Placebo Beetroot Juice Without Nitrate
Dietary Supplement
Lead sponsor
Indiana University
Other
Eligibility
18 Years to 44 Years · Male only
Enrollment
24 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2026
U.S. locations
1
States / cities
Indianapolis, Indiana
Source: ClinicalTrials.gov public record
Updated Feb 22, 2026 · Synced Jul 22, 2026, 9:40 AM EDT
Completed Phase 2 Interventional

Combining Ipilimumab, Degarelix, and Radical Prostatectomy in Men With Newly Diagnosed Metastatic Castration Sensitive Prostate Cancer or Ipilimumab and Degarelix in Men With Biochemically Recurrent Castration Sensitive Prostate Cancer After Radical Prostatectomy

NCT02020070
View directory record Official record
Conditions
Metastatic Castration Sensitive Prostate Cancer
Interventions
Degarelix, Ipilimumab, Radical Prostatectomy
Drug · Procedure
Lead sponsor
Memorial Sloan Kettering Cancer Center
Other
Eligibility
18 Years and older · Male only
Enrollment
16 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2026
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Jul 5, 2026 · Synced Jul 22, 2026, 9:40 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

Pilot Project to Examine the Effects of Exercise on Nocturnal Lipolysis in Men and Women

NCT02408510
View directory record Official record
Conditions
Healthy
Interventions
Not listed
Lead sponsor
University of Colorado, Denver
Other
Eligibility
20 Years to 35 Years
Enrollment
15 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2017
U.S. locations
1
States / cities
Aurora, Colorado
Source: ClinicalTrials.gov public record
Updated Jun 30, 2019 · Synced Jul 22, 2026, 9:40 AM EDT
Completed Not applicable Interventional Results available

Effect of Caloric Restriction on Fat Oxidation in Obese Men and Women (Magellan II)

NCT01616082
View directory record Official record
Conditions
Obesity, Overweight, Metabolic Diseases
Interventions
Low Calorie Diet (LCD), Phentermine
Behavioral · Drug
Lead sponsor
AdventHealth Translational Research Institute
Other
Eligibility
18 Years to 55 Years
Enrollment
39 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2012
U.S. locations
1
States / cities
Orlando, Florida
Source: ClinicalTrials.gov public record
Updated Nov 12, 2020 · Synced Jul 22, 2026, 9:40 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

PrEP Affect Regulation Treatment Innovation

NCT04899024
View directory record Official record
Conditions
Medication Adherence, HIV Prevention, Stimulant Use
Interventions
PARTI, Attention-Control, Contingency Management for PrEP Adherence
Behavioral
Lead sponsor
Florida International University
Other
Eligibility
18 Years and older · Male only
Enrollment
239 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2026
U.S. locations
2
States / cities
San Francisco, California • Miami, Florida
Source: ClinicalTrials.gov public record
Updated May 6, 2026 · Synced Jul 22, 2026, 9:40 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Study Evaluating the Effect of Multiple Doses of Itraconazole on the Drug Lu AF35700 in Healthy Young Men and Women

NCT03103646
View directory record Official record
Conditions
Cytochrome P450 Interaction
Interventions
Lu AF35700, Itraconazole (200 mg), Itraconazole (300 mg)
Drug
Lead sponsor
H. Lundbeck A/S
Industry
Eligibility
18 Years to 55 Years
Enrollment
22 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2019
U.S. locations
1
States / cities
Dallas, Texas
Source: ClinicalTrials.gov public record
Updated Oct 1, 2019 · Synced Jul 22, 2026, 9:40 AM EDT
Completed Not applicable Interventional Results available

The Getting Off App for Methamphetamine-Using Gay and Bisexual Men

NCT03884946
View directory record Official record
Conditions
Methamphetamine Abuse, HIV/AIDS
Interventions
Getting Off App
Other
Lead sponsor
Friends Research Institute, Inc.
Other
Eligibility
18 Years to 65 Years · Male only
Enrollment
226 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2024
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Jan 28, 2026 · Synced Jul 22, 2026, 9:40 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

A Crossover Clinical Trial Investigating the Effects of Geranylgeraniol (GG) Supplementation on Testosterone Levels in Healthy Men and Women Over an 18-week Period

NCT06747624
View directory record Official record
Conditions
Wellness, Health
Interventions
Geranylgeraniol 300 mg, Placebo
Dietary Supplement
Lead sponsor
Designs for Health
Industry
Eligibility
40 Years to 65 Years
Enrollment
34 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025
U.S. locations
1
States / cities
Palm Coast, Florida
Source: ClinicalTrials.gov public record
Updated Apr 30, 2026 · Synced Jul 22, 2026, 9:40 AM EDT
Active, not recruiting Phase 2 Interventional

Study of RV001V in Biochemical Failure Following Curatively Intended Therapy For Localized Prostate Cancer

NCT04114825
View directory record Official record
Conditions
Prostate Cancer Recurrent
Interventions
RV001V, Placebo
Biological · Other
Lead sponsor
RhoVac APS
Industry
Eligibility
18 Years and older · Male only
Enrollment
180 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2022
U.S. locations
7
States / cities
Clearwater, Florida • Towson, Maryland • Omaha, Nebraska + 4 more
Source: ClinicalTrials.gov public record
Updated Sep 27, 2021 · Synced Jul 22, 2026, 9:40 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

Self-Consent for PrEP Perspectives

NCT02801760
View directory record Official record
Conditions
HIV, PrEP
Interventions
Not listed
Lead sponsor
University of North Carolina, Chapel Hill
Other
Eligibility
15 Years to 22 Years · Male only
Enrollment
58 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2016
U.S. locations
11
States / cities
Los Angeles, California • Miami, Florida • Tampa, Florida + 8 more
Source: ClinicalTrials.gov public record
Updated Feb 27, 2017 · Synced Jul 22, 2026, 9:40 AM EDT
Completed Phase 4 Interventional

A Multicenter, Double-blind Study to Evaluate the Effect of Pretreatment With a Daily Dose of Sildenafil on the As-Needed Efficacy of Viagra in Men With Erectile Dysfunction and Type 2 Diabetes

NCT00645268
View directory record Official record
Conditions
Erectile Dysfunction, Diabetes Mellitus, Type 2
Interventions
sildenafil, placebo
Drug
Lead sponsor
Pfizer's Upjohn has merged with Mylan to form Viatris Inc.
Industry
Eligibility
35 Years to 70 Years · Male only
Enrollment
300 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2002 – 2004
U.S. locations
28
States / cities
Huntsville, Alabama • Phoenix, Arizona • Beverly Hills, California + 21 more
Source: ClinicalTrials.gov public record
Updated Jan 31, 2021 · Synced Jul 22, 2026, 9:40 AM EDT
Withdrawn Phase 2 Interventional

A Phase II Neoadjuvant Study of Enzalutamide, Abiraterone Acetate, Dutasteride and Degarelix in Men With Localized Prostate Cancer Pre-prostatectomy

NCT02159690
View directory record Official record
Conditions
Prostate Cancer, Localized Prostate Cancer
Interventions
Enzalutamide, Abiraterone acetate, Prednisone, Dutasteride, Degarelix
Drug
Lead sponsor
Kenneth Pienta, MD
Other
Eligibility
18 Years and older · Male only
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2015
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Jan 25, 2015 · Synced Jul 22, 2026, 9:40 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Impact of Beef's Unique Food Matrix on Human Health

NCT04841460
View directory record Official record
Conditions
Cholesterol, LDL, Cholesterol, HDL, Research Subjects
Interventions
Low-fat ground beef, High-fat ground beef
Dietary Supplement
Lead sponsor
Texas A&M University
Other
Eligibility
Male only
Enrollment
25 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019
U.S. locations
1
States / cities
College Station, Texas
Source: ClinicalTrials.gov public record
Updated Apr 11, 2021 · Synced Jul 22, 2026, 9:40 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Buck Institute Ketone Ester RCT

NCT05585762
View directory record Official record
Conditions
Tolerance, Safety Issues, Aging
Interventions
Ketone ester, Non-ketone placebo
Other
Lead sponsor
Buck Institute for Research on Aging
Other
Eligibility
65 Years and older
Enrollment
30 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2024
U.S. locations
1
States / cities
Novato, California
Source: ClinicalTrials.gov public record
Updated Jun 10, 2024 · Synced Jul 22, 2026, 9:40 AM EDT
Completed Not applicable Interventional Results available

Penile Length Restoration in Men With Diabetes Mellitus, Type II

NCT03756688
View directory record Official record
Conditions
Diabetes Mellitus, Type 2, Penile Diseases
Interventions
RestoreX PTT - 6 months, RestoreX PTT - 3 months
Device
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years and older · Male only
Enrollment
110 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2021
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Feb 20, 2023 · Synced Jul 22, 2026, 9:40 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Project PRIDE (Promoting Resilience In Discriminatory Environments)

NCT03528135
View directory record Official record
Conditions
Human Immunodeficiency Virus, Sexually Transmitted Infections, Anxiety, Depression, Substance Use Disorders
Interventions
Project PRIDE
Behavioral
Lead sponsor
University of Houston
Other
Eligibility
18 Years to 25 Years
Enrollment
17 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2022
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated May 24, 2022 · Synced Jul 22, 2026, 9:40 AM EDT
Completed Phase 4 Interventional Results available

Dutasteride Treatment for the Reduction of Heavy Drinking in Men

NCT01758523
View directory record Official record
Conditions
Alcoholism, Alcohol Abuse, Alcohol Dependence
Interventions
Dutasteride, sugar pill
Drug
Lead sponsor
UConn Health
Other
Eligibility
18 Years to 70 Years · Male only
Enrollment
189 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2018
U.S. locations
1
States / cities
Farmington, Connecticut
Source: ClinicalTrials.gov public record
Updated Apr 25, 2019 · Synced Jul 22, 2026, 9:40 AM EDT
Completed Not applicable Interventional

PTSD Treatment for Incarcerated Men and Women: WPP

NCT05432817
View directory record Official record
Conditions
PTSD
Interventions
Cognitive Processing Therapy
Behavioral
Lead sponsor
University of Wisconsin, Madison
Other
Eligibility
18 Years and older
Enrollment
117 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2026
U.S. locations
1
States / cities
Madison, Wisconsin
Source: ClinicalTrials.gov public record
Updated Apr 23, 2026 · Synced Jul 22, 2026, 9:40 AM EDT
Completed No phase listed Observational Results available

A Registry of Sipuleucel-T Therapy in Men With Advanced Prostate Cancer

NCT01306890
View directory record Official record
Conditions
Advanced Prostate Cancer, Prostatic Neoplasms
Interventions
sipuleucel-T
Biological
Lead sponsor
Dendreon
Industry
Eligibility
18 Years and older · Male only
Enrollment
1,976 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2017
U.S. locations
333
States / cities
Bessemer, Alabama • Birmingham, Alabama • Huntsville, Alabama + 245 more
Source: ClinicalTrials.gov public record
Updated Jun 6, 2019 · Synced Jul 22, 2026, 9:40 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

A Study to Detect Radioactivity of [14C]-OPC-167832 in Urine and Feces in Healthy Men

NCT07314320
View directory record Official record
Conditions
Healthy Volunteers
Interventions
[14C]-OPC-167832
Drug
Lead sponsor
Otsuka Pharmaceutical Development & Commercialization, Inc.
Industry
Eligibility
18 Years to 55 Years · Male only
Enrollment
8 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023
U.S. locations
1
States / cities
Lincoln, Nebraska
Source: ClinicalTrials.gov public record
Updated Jan 1, 2026 · Synced Jul 22, 2026, 9:40 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

eTest: Real-time, Remote Monitoring System for Home-based HIV Testing Among High-risk Men Who Have Sex With Men

NCT03654690
View directory record Official record
Conditions
HIV Infections
Interventions
HIV self-test, Counseling
Diagnostic Test · Behavioral
Lead sponsor
Brown University
Other
Eligibility
18 Years and older · Male only
Enrollment
811 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2023
U.S. locations
1
States / cities
Providence, Rhode Island
Source: ClinicalTrials.gov public record
Updated Apr 9, 2025 · Synced Jul 22, 2026, 9:40 AM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

The Impact of Dietary Pattern on Erectile Function

NCT04349059
View directory record Official record
Conditions
Erectile Dysfunction
Interventions
Animal based diet, Plant based diet
Other
Lead sponsor
Montefiore Medical Center
Other
Eligibility
18 Years to 35 Years · Male only
Enrollment
46 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2026
U.S. locations
1
States / cities
The Bronx, New York
Source: ClinicalTrials.gov public record
Updated Nov 11, 2025 · Synced Jul 22, 2026, 9:40 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Being Responsible for Ourselves HIV Risk Reduction for Black MSM

NCT02561286
View directory record Official record
Conditions
Human Immunodeficiency Virus Infection (HIV), Sexually Transmitted Disease (STD)
Interventions
BRO HIV Risk Reduction Intervention, Health Promotion Intervention
Behavioral
Lead sponsor
University of Pennsylvania
Other
Eligibility
18 Years and older · Male only
Enrollment
595 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008 – 2012
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Sep 28, 2015 · Synced Jul 22, 2026, 9:40 AM EDT
Completed Not applicable Interventional Results available

D Vitamin Intervention in VA

NCT01375660
View directory record Official record
Conditions
Impaired Fasting Glucose, Impaired Glucose Tolerance, Vitamin D Insufficiency
Interventions
Placebo, 50K vitamin D2
Drug
Lead sponsor
US Department of Veterans Affairs
Federal
Eligibility
35 Years to 85 Years · Male only
Enrollment
205 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2014
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Mar 5, 2015 · Synced Jul 22, 2026, 9:40 AM EDT