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Showing 1–24 of 40 matching trials from the live ClinicalTrials.gov search.
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Completed Early Phase 1 Interventional Accepts healthy volunteers Results available

Effects of L-theanine on Motor Cortex Excitability in Healthy Subjects: A Paired-Pulse TMS Study

NCT04749745
View directory record Official record
Conditions
Cortical Excitability, Psychiatric Disorder
Interventions
L-theanine, Placebo
Drug
Lead sponsor
Butler Hospital
Other
Eligibility
18 Years to 65 Years
Enrollment
11 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2021
U.S. locations
1
States / cities
Providence, Rhode Island
Source: ClinicalTrials.gov public record
Updated Sep 22, 2021 · Synced Sep 2, 2026, 10:13 PM EDT
Active, not recruiting No phase listed Observational Accepts healthy volunteers

Estrogen and Microvascular Function

NCT06043310
View directory record Official record
Conditions
Estrogen, Cardiovascular Diseases, Microvasculature, Oral Contraceptive Use
Interventions
Nω-nitro-L-arginine methyl ester (L-NAME), Acetylcholine, Sodium Nitroprusside
Drug
Lead sponsor
Medical College of Wisconsin
Other
Eligibility
18 Years to 40 Years · Female only
Enrollment
45 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2031
U.S. locations
1
States / cities
Wauwatosa, Wisconsin
Source: ClinicalTrials.gov public record
Updated Jul 28, 2026 · Synced Sep 2, 2026, 10:13 PM EDT
Recruiting Early Phase 1 Interventional Accepts healthy volunteers

Sensitivity of Angiotensin II Type II Receptors in Women Following Preeclampsia

NCT05937841
View directory record Official record
Conditions
Preeclampsia Postpartum
Interventions
Compound 21
Drug
Lead sponsor
Anna Stanhewicz, PhD
Other
Eligibility
18 Years to 45 Years · Female only
Enrollment
30 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2026
U.S. locations
1
States / cities
Iowa City, Iowa
Source: ClinicalTrials.gov public record
Updated Aug 23, 2025 · Synced Sep 2, 2026, 10:13 PM EDT
Active, not recruiting Early Phase 1 Interventional Accepts healthy volunteers

Role of NADPH Oxidase in Microvascular Dysfunction Following GDM

NCT05946798
View directory record Official record
Conditions
Gestational Diabetes, Oxidative Stress, Vascular Endothelial Function
Interventions
Acetylcholine, Insulin aspart
Drug
Lead sponsor
Anna Stanhewicz, PhD
Other
Eligibility
18 Years to 50 Years · Female only
Enrollment
40 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2028
U.S. locations
1
States / cities
Iowa City, Iowa
Source: ClinicalTrials.gov public record
Updated Jul 28, 2026 · Synced Sep 2, 2026, 10:13 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Role of Nitric Oxide in the Impact of Aging on Myocardial Remodeling

NCT00603720
View directory record Official record
Conditions
Cardiovascular Diseases
Interventions
L-NAME, L-Arginine, Phenylephrine
Drug
Lead sponsor
Washington University School of Medicine
Other
Eligibility
18 Years to 75 Years
Enrollment
54 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2005 – 2008
U.S. locations
1
States / cities
St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated Sep 11, 2018 · Synced Sep 2, 2026, 10:13 PM EDT
Recruiting Early Phase 1 Interventional Accepts healthy volunteers

Sex Differences in the Vascular Effects of E-cigarette Use

NCT06159608
View directory record Official record
Conditions
E-cigarette Use
Interventions
Local heating + L-NAME (NG-nitro-L-arginine methyl ester; nitric oxide synthase inhibitor), Chronic estrogen exposure
Drug · Other
Lead sponsor
Anna Stanhewicz, PhD
Other
Eligibility
18 Years to 24 Years
Enrollment
80 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2026
U.S. locations
1
States / cities
Iowa City, Iowa
Source: ClinicalTrials.gov public record
Updated Dec 14, 2025 · Synced Sep 2, 2026, 10:13 PM EDT
Recruiting Early Phase 1 Interventional Accepts healthy volunteers

Oxidative Stress in Microvascular Dysfunction Following Gestational Diabetes

NCT05946785
View directory record Official record
Conditions
Gestational Diabetes, Vascular Endothelial Function
Interventions
Acetylcholine, insulin aspart
Drug
Lead sponsor
Anna Stanhewicz, PhD
Other
Eligibility
18 Years to 50 Years · Female only
Enrollment
28 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2027
U.S. locations
1
States / cities
Iowa City, Iowa
Source: ClinicalTrials.gov public record
Updated Jul 28, 2026 · Synced Sep 2, 2026, 10:13 PM EDT
Completed Phase 2 Interventional Accepts healthy volunteers Results available

Antioxidant Therapy With N-acetylcysteine for Children With Neurofibromatosis Type 1

NCT04481048
View directory record Official record
Conditions
Neurofibromatosis 1
Interventions
N-Acetyl cysteine, Placebo
Drug · Other
Lead sponsor
Children's Hospital Medical Center, Cincinnati
Other
Eligibility
8 Years to 16 Years
Enrollment
25 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2024
U.S. locations
1
States / cities
Cincinnati, Ohio
Source: ClinicalTrials.gov public record
Updated Jun 4, 2026 · Synced Sep 2, 2026, 10:13 PM EDT
Completed Phase 2Phase 3 Interventional Accepts healthy volunteers Results available

Exhaled Levels of Nitric Oxide

NCT00753948
View directory record Official record
Conditions
Tetraplegia, Asthma
Interventions
N-Nitro L-arginine-methylester (L-NAME)
Drug
Lead sponsor
VA Office of Research and Development
Federal
Eligibility
18 Years to 65 Years
Enrollment
23 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2006 – 2010
U.S. locations
1
States / cities
The Bronx, New York
Source: ClinicalTrials.gov public record
Updated Feb 27, 2020 · Synced Sep 2, 2026, 10:13 PM EDT
Recruiting Phase 3 Interventional

Accelerated v's Standard BEP Chemotherapy for Patients With Intermediate and Poor-risk Metastatic Germ Cell Tumours

NCT02582697
View directory record Official record
Conditions
Germ Cell Tumor
Interventions
Bleomycin (active name: Bleomycin Sulfate), Etoposide, Cisplatin, Pegylated G-CSF (Pegfilgrastim), Filgrastim
Drug
Lead sponsor
University of Sydney
Other
Eligibility
11 Years to 50 Years
Enrollment
500 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2029
U.S. locations
21
States / cities
Downey, California • Loma Linda, California • Long Beach, California + 15 more
Source: ClinicalTrials.gov public record
Updated Aug 31, 2026 · Synced Sep 2, 2026, 10:13 PM EDT
Completed No phase listed Observational Results available

Apogee, A HeartWare HVAD Destination Product Surveillance Registry (PSR) Platform

NCT03697980
View directory record Official record
Conditions
Chronic Heart Failure
Interventions
HeartWare Ventricular Assist Device
Device
Lead sponsor
Medtronic Cardiac Rhythm and Heart Failure
Industry
Eligibility
18 Years and older
Enrollment
136 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2022
U.S. locations
33
States / cities
Little Rock, Arkansas • San Diego, California • San Francisco, California + 25 more
Source: ClinicalTrials.gov public record
Updated Dec 3, 2023 · Synced Sep 2, 2026, 10:13 PM EDT
Active, not recruiting Early Phase 1 Interventional Accepts healthy volunteers

MR and Inflammation After Preeclampsia

NCT07345845
View directory record Official record
Conditions
Preeclampsia, Preeclampsia Postpartum
Interventions
Eplerenone
Drug
Lead sponsor
Anna Stanhewicz, PhD
Other
Eligibility
18 Years to 45 Years · Female only
Enrollment
40 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2029
U.S. locations
1
States / cities
Iowa City, Iowa
Source: ClinicalTrials.gov public record
Updated Jan 15, 2026 · Synced Sep 2, 2026, 10:13 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Local Antioxidant Therapy Vasoconstriction Effects in Different Races

NCT03684213
View directory record Official record
Conditions
Cardiovascular Diseases, Cardiovascular Risk Factor, Vasoconstriction
Interventions
Control (Norepinephrine), Norepinephrine + Ascorbic Acid, Norepinephrine + L-NAME, Norepinephrine + L-NAME + Ascorbic Acid
Drug
Lead sponsor
The University of Texas at Arlington
Other
Eligibility
18 Years to 35 Years
Enrollment
22 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2024
U.S. locations
1
States / cities
Arlington, Texas
Source: ClinicalTrials.gov public record
Updated Jun 10, 2024 · Synced Sep 2, 2026, 10:13 PM EDT
Recruiting Early Phase 1 Interventional Accepts healthy volunteers

Vascular Effects of High-Salt After Preeclampsia

NCT06749418
View directory record Official record
Conditions
Preeclampsia, Preeclampsia Postpartum
Interventions
Eplerenone
Drug
Lead sponsor
Anna Stanhewicz, PhD
Other
Eligibility
18 Years to 45 Years · Female only
Enrollment
40 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2027
U.S. locations
1
States / cities
Iowa City, Iowa
Source: ClinicalTrials.gov public record
Updated Feb 12, 2026 · Synced Sep 2, 2026, 10:13 PM EDT
Completed Phase 2Phase 3 Interventional Accepts healthy volunteers Results available

Prevention of Low Blood Pressure in Persons With Tetraplegia

NCT00237770
View directory record Official record
Conditions
Hypotension, Spinal Cord Injury
Interventions
N-Nitro L-arginine-methylester (L-NAME), Head-up Tilt maneuver
Drug · Procedure
Lead sponsor
US Department of Veterans Affairs
Federal
Eligibility
18 Years to 65 Years
Enrollment
16 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2003 – 2010
U.S. locations
1
States / cities
The Bronx, New York
Source: ClinicalTrials.gov public record
Updated May 18, 2014 · Synced Sep 2, 2026, 10:13 PM EDT
Completed Early Phase 1 Interventional Accepts healthy volunteers

Long COVID-19 [11C]CPPC Study

NCT06223971
View directory record Official record
Conditions
COVID Long-Haul
Interventions
[11C]CPPC Injection
Drug
Lead sponsor
Johns Hopkins University
Other
Eligibility
18 Years and older
Enrollment
6 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2026
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Apr 29, 2026 · Synced Sep 2, 2026, 10:13 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

The Effect of Antioxidants on Skin Blood Flow-BH4

NCT03680573
View directory record Official record
Conditions
Cardiovascular Diseases, Cardiovascular Risk Factor, Vasoconstriction
Interventions
Control: Lacated Ringers, Apocynin, Allopurinol, BH4, NG Nitro L Arginine Methyl Ester, Sodium Nitroprusside, Acetyl-ß-methylcholine chloride
Drug
Lead sponsor
The University of Texas at Arlington
Other
Eligibility
18 Years to 35 Years
Enrollment
16 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018
U.S. locations
1
States / cities
Arlington, Texas
Source: ClinicalTrials.gov public record
Updated Sep 25, 2018 · Synced Sep 2, 2026, 10:13 PM EDT
Recruiting Early Phase 1 Interventional Accepts healthy volunteers

Prenatal Aspirin and Postpartum Vascular Function

NCT05653973
View directory record Official record
Conditions
Preeclampsia, Microvascular Function
Interventions
Acetylcholine, Endothelin-1
Drug
Lead sponsor
Anna Stanhewicz, PhD
Other
Eligibility
18 Years to 50 Years · Female only
Enrollment
60 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2027
U.S. locations
1
States / cities
Iowa City, Iowa
Source: ClinicalTrials.gov public record
Updated May 30, 2025 · Synced Sep 2, 2026, 10:13 PM EDT
Recruiting Phase 1 Interventional Accepts healthy volunteers

The Impact of Gestational Diabetes Mellitus on Cerebral Blood Flow and Cerebrovascular Function After Pregnancy

NCT06911372
View directory record Official record
Conditions
Gestational Diabetes Mellitus (GDM), Postpartum Women, Uncomplicated Pregnancy
Interventions
Intradermal Microdialysis, Brain Blood Flow Tests, Local Heating
Drug · Other
Lead sponsor
Anna Stanhewicz, PhD
Other
Eligibility
18 Years to 50 Years · Female only
Enrollment
84 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2028
U.S. locations
1
States / cities
Iowa City, Iowa
Source: ClinicalTrials.gov public record
Updated Dec 15, 2025 · Synced Sep 2, 2026, 10:13 PM EDT
Completed Phase 2 Interventional Results available

A Placebo-Controlled Trial of St. John's Wort for Irritable Bowel Syndrome

NCT00587860
View directory record Official record
Conditions
Irritable Bowel Syndrome
Interventions
St. John's wort, Placebo
Drug
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years to 70 Years
Enrollment
70 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2008
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Mar 8, 2010 · Synced Sep 2, 2026, 10:13 PM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Linking Affective Dynamics in Response to Daily Stress to Peripheral Vascular Function in Working Age Adults

NCT06860724
View directory record Official record
Conditions
Major Depressive Disorder
Interventions
NG-nitro-L-arginine methyl ester (L-NAME)
Other
Lead sponsor
University of Delaware
Other
Eligibility
18 Years to 55 Years
Enrollment
18 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2031
U.S. locations
1
States / cities
Newark, Delaware
Source: ClinicalTrials.gov public record
Updated Sep 16, 2025 · Synced Sep 2, 2026, 10:13 PM EDT
Withdrawn Early Phase 1 Interventional

Novel Supplement-based Therapy for the Treatment of Small Intestinal Bacterial Overgrowth

NCT03420976
View directory record Official record
Conditions
Small Intestinal Bacterial Overgrowth
Interventions
Novel Supplement Based Therapy
Dietary Supplement
Lead sponsor
Atrium Innovations
Industry
Eligibility
19 Years to 84 Years
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2019
U.S. locations
1
States / cities
Oxford, Ohio
Source: ClinicalTrials.gov public record
Updated Jan 11, 2021 · Synced Sep 2, 2026, 10:13 PM EDT
Completed Phase 2 Interventional Accepts healthy volunteers Results available

Antioxidant Therapy With N-acetylcysteine for Learning and Motor Behavior in Children With Neurofibromatosis Type 1

NCT04481035
View directory record Official record
Conditions
Neurofibromatosis 1
Interventions
N-acetylcysteine (NAC), Placebo
Drug · Other
Lead sponsor
Children's Hospital Medical Center, Cincinnati
Other
Eligibility
8 Years to 16 Years
Enrollment
5 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2021
U.S. locations
1
States / cities
Cincinnati, Ohio
Source: ClinicalTrials.gov public record
Updated Apr 20, 2026 · Synced Sep 2, 2026, 10:13 PM EDT
Recruiting Early Phase 1 Interventional Accepts healthy volunteers

Antidepressant Therapy for Improved Blood Vessel Health After Preeclampsia

NCT07715669
View directory record Official record
Conditions
Preeclampsia, Endothelial Function
Interventions
Paroxetine Hydrochloride, Ascorbic acid (Vitamin C)
Drug
Lead sponsor
Anna Stanhewicz, PhD
Other
Eligibility
18 Years to 45 Years · Female only
Enrollment
40 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2026 – 2027
U.S. locations
1
States / cities
Iowa City, Iowa
Source: ClinicalTrials.gov public record
Updated Jul 28, 2026 · Synced Sep 2, 2026, 10:13 PM EDT