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Showing 1–24 of 72 matching trials from the live ClinicalTrials.gov search.
Local D1 index available.
Filters: Intervention: citrulline Clear all
Completed Early Phase 1 Interventional Results available

Treatment of HFpEF With Nitrate Supplement

NCT03289481
View directory record Official record
Conditions
Heart Failure With Normal Ejection Fraction
Interventions
Active lozenge, Placebo
Dietary Supplement · Drug
Lead sponsor
MaineHealth
Other
Eligibility
18 Years and older
Enrollment
13 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2018
U.S. locations
1
States / cities
Rockport, Maine
Source: ClinicalTrials.gov public record
Updated Oct 5, 2021 · Synced Sep 10, 2026, 8:14 AM EDT
Not listed Phase 1 Interventional

PK and PD Responses to Oral L-Citrulline in Patients With Sickle Cell Disease

NCT00343954
View directory record Official record
Conditions
Sickle Cell Disease
Interventions
L-citrulline tablets, 1000 mg
Drug
Lead sponsor
Angiogenix
Industry
Eligibility
10 Years and older
Enrollment
12 participants
Healthy volunteers
Healthy volunteers not accepted
U.S. locations
1
States / cities
Pittsburgh, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Jun 22, 2006 · Synced Sep 10, 2026, 8:14 AM EDT
Not listed Not applicable Interventional Accepts healthy volunteers

A Clinical Study to Evaluate the Efficacy of Four Supplements on Improving Readiness for Intimacy

NCT05862519
View directory record Official record
Conditions
Libido, Intimacy, Gastrointestinal Issues
Interventions
Reset, Stay Ready Fiber, Libido, Testosterone supplement
Dietary Supplement
Lead sponsor
906 CMVI Holdings
Industry
Eligibility
18 Years to 44 Years · Male only
Enrollment
36 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023
U.S. locations
1
States / cities
Santa Monica, California
Source: ClinicalTrials.gov public record
Updated May 16, 2023 · Synced Sep 10, 2026, 8:14 AM EDT
Terminated No phase listed Observational Results available

Observational Study That Will Collect Information on Patients With Urea Cycle Disorders (UCDs)

NCT01948427
View directory record Official record
Conditions
Urea Cycle Disorder
Interventions
Not listed
Lead sponsor
Amgen
Industry
Eligibility
Not listed
Enrollment
203 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2020
U.S. locations
1
States / cities
Blue Bell, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Jun 30, 2024 · Synced Sep 10, 2026, 8:14 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Evaluation of Sports Supplements on Blood Flow

NCT04278053
View directory record Official record
Conditions
Determine the Effects of Nitrosigine and Citrulline-malate on Flow-mediated Dilation Among Young Adults
Interventions
inositol-stabilized arginine silicate
Dietary Supplement
Lead sponsor
University of Arkansas, Fayetteville
Other
Eligibility
18 Years to 29 Years
Enrollment
24 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2019
U.S. locations
1
States / cities
Fayetteville, Arkansas
Source: ClinicalTrials.gov public record
Updated May 23, 2022 · Synced Sep 10, 2026, 8:14 AM EDT
Completed Early Phase 1 Interventional

Application of Ergogenic Aids to the Prehabilitation of Abdominal Cancer Patients Undergoing Cancer Surgery

NCT04073381
View directory record Official record
Conditions
Prehabilitation
Interventions
Prehabilitation Program
Combination Product
Lead sponsor
University of Texas at Austin
Other
Eligibility
18 Years to 90 Years
Enrollment
92 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2020
U.S. locations
1
States / cities
Austin, Texas
Source: ClinicalTrials.gov public record
Updated Jul 7, 2021 · Synced Sep 10, 2026, 8:14 AM EDT
Completed Phase 1 Interventional Results available

Enteral L Citrulline Supplementation in Preterm Infants - Safety, Efficacy and Dosing

NCT03649932
View directory record Official record
Conditions
Bronchopulmonary Dysplasia, Bronchopulmonary Dysplasia Associated Pulmonary Hypertension, Pulmonary Hypertension, Premature Birth, Chronic Lung Disease of Prematurity
Interventions
Enteral L-citrulline
Dietary Supplement
Lead sponsor
The University of Texas Medical Branch, Galveston
Other
Eligibility
Up to 30 Weeks
Enrollment
42 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2021
U.S. locations
1
States / cities
Galveston, Texas
Source: ClinicalTrials.gov public record
Updated Oct 24, 2021 · Synced Sep 10, 2026, 8:14 AM EDT
Completed Phase 3 Interventional

Intravenous L-Citrulline to Treat Children Undergoing Heart Bypass Surgery

NCT00335244
View directory record Official record
Conditions
Heart Defects, Congenital, Hypertension, Pulmonary
Interventions
L-citrulline, Placebo of intravenous L-citrulline
Drug
Lead sponsor
Asklepion Pharmaceuticals, LLC
Industry
Eligibility
Up to 17 Years
Enrollment
77 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2009
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Feb 1, 2015 · Synced Sep 10, 2026, 8:14 AM EDT
Not yet recruiting Phase 2 Interventional

Tisotumab Vedotin in Squamous Cell Carcinoma of the Vulva

NCT07672782
View directory record Official record
Conditions
Vulvar Carcinoma, Recurrent or Metastatic Vulvar Cancer, Squamous Cell Carcinoma Vulva
Interventions
Tisotumab Vedotin
Drug
Lead sponsor
GOG Foundation
Network
Eligibility
18 Years and older · Female only
Enrollment
28 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2029
U.S. locations
1
States / cities
Charlotte, North Carolina
Source: ClinicalTrials.gov public record
Updated Jun 28, 2026 · Synced Sep 10, 2026, 8:14 AM EDT
Terminated Phase 1Phase 2 Interventional

L-citrulline Injection in Patients Aged 6-21 Years Old with Sickle Cell Disease Presenting with Vaso-Occlusive Crisis (VOC)

NCT04852172
View directory record Official record
Conditions
Acute Vaso Occlusive Crisis (VOC)
Interventions
L-citrulline, D5 1/2NS
Drug · Other
Lead sponsor
Asklepion Pharmaceuticals, LLC
Industry
Eligibility
6 Years to 21 Years
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2024
U.S. locations
2
States / cities
Washington D.C., District of Columbia • Jackson, Mississippi
Source: ClinicalTrials.gov public record
Updated Sep 18, 2024 · Synced Sep 10, 2026, 8:14 AM EDT
Completed Phase 1 Interventional Results available

A Phase 1 Study of Continuous Intravenous L-citrulline During Sickle Cell Pain Crisis or Acute Chest Syndrome

NCT02697240
View directory record Official record
Conditions
Sickle Cell Disease
Interventions
Intravenous citrulline
Drug
Lead sponsor
University of Mississippi Medical Center
Other
Eligibility
6 Years to 50 Years
Enrollment
4 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2017
U.S. locations
1
States / cities
Jackson, Mississippi
Source: ClinicalTrials.gov public record
Updated Jun 24, 2019 · Synced Sep 10, 2026, 8:14 AM EDT
Completed Not applicable Interventional

Very Low Calorie Diet Weight Loss

NCT02780206
View directory record Official record
Conditions
Obesity, Very Low Calorie Diet
Interventions
Stable isotope amino acid infusion
Other
Lead sponsor
Texas A&M University
Other
Eligibility
30 Years and older
Enrollment
56 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2018
U.S. locations
1
States / cities
College Station, Texas
Source: ClinicalTrials.gov public record
Updated Feb 3, 2022 · Synced Sep 10, 2026, 8:14 AM EDT
Completed Phase 1 Interventional

L-Citrulline Supplementation Pilot Study for Overweight Late Onset Asthmatics

NCT01715844
View directory record Official record
Conditions
Asthma
Interventions
L-citrulline
Dietary Supplement
Lead sponsor
University of Pittsburgh
Other
Eligibility
18 Years to 75 Years
Enrollment
10 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2017
U.S. locations
1
States / cities
Pittsburgh, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Jul 1, 2017 · Synced Sep 10, 2026, 8:14 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

2 Weeks of Citrulline Supplementation on Arterial Function in Postmenopausal Women With Elevated Blood Pressure or Hypertension

NCT06025383
View directory record Official record
Conditions
Menopause, Hypertension
Interventions
L-Citrulline, Placebo
Dietary Supplement
Lead sponsor
Texas Tech University
Other
Eligibility
50 Years to 70 Years · Female only
Enrollment
19 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2024
U.S. locations
1
States / cities
Lubbock, Texas
Source: ClinicalTrials.gov public record
Updated May 14, 2025 · Synced Sep 10, 2026, 8:14 AM EDT
Completed Phase 1Phase 2 Interventional Accepts healthy volunteers

L-citrulline Supplementation, Cold Exposure, & Post-Exercise Muscle Ischemia

NCT02104375
View directory record Official record
Conditions
Hypertension
Interventions
L-citrulline
Dietary Supplement
Lead sponsor
Florida State University
Other
Eligibility
18 Years to 35 Years · Male only
Enrollment
16 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2014
U.S. locations
1
States / cities
Tallahassee, Florida
Source: ClinicalTrials.gov public record
Updated Mar 9, 2015 · Synced Sep 10, 2026, 8:14 AM EDT
Completed Not applicable Interventional

Asthma L-Citrulline Pilot Study

NCT02943161
View directory record Official record
Conditions
Asthma
Interventions
L-Citrulline
Dietary Supplement
Lead sponsor
University of Colorado, Denver
Other
Eligibility
18 Years to 70 Years
Enrollment
41 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2019
U.S. locations
2
States / cities
Aurora, Colorado • Durham, North Carolina
Source: ClinicalTrials.gov public record
Updated Feb 26, 2020 · Synced Sep 10, 2026, 8:14 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Whole Body Vibration Combined With L-citrulline Supplementation on Cardiovascular Function and Body Composition

NCT02143817
View directory record Official record
Conditions
Obesity, Pre-hypertension, Hypertension
Interventions
L-citrulline supplementation, Whole Body Vibration Training
Dietary Supplement · Other
Lead sponsor
Florida State University
Other
Eligibility
50 Years to 70 Years · Female only
Enrollment
60 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2014
U.S. locations
1
States / cities
Tallahassee, Florida
Source: ClinicalTrials.gov public record
Updated Mar 9, 2015 · Synced Sep 10, 2026, 8:14 AM EDT
Completed Phase 1Phase 2 Interventional Accepts healthy volunteers

L-citrulline Supplementation & Cold Exposure

NCT01462591
View directory record Official record
Conditions
Hypertension
Interventions
L-citrulline
Dietary Supplement
Lead sponsor
Florida State University
Other
Eligibility
18 Years to 35 Years · Male only
Enrollment
16 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2012
U.S. locations
1
States / cities
Tallahassee, Florida
Source: ClinicalTrials.gov public record
Updated Aug 4, 2014 · Synced Sep 10, 2026, 8:14 AM EDT
Withdrawn Phase 1 Interventional

Phase 1 Intravenous Citrulline for the Prevention of Bronchopulmonary Dysplasia in Preterm Infants

NCT00742534
View directory record Official record
Conditions
Bronchopulmonary Dysplasia
Interventions
Intravenous L-Citrulline
Drug
Lead sponsor
Vanderbilt University
Other
Eligibility
2 Days to 14 Days
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2009
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Dec 29, 2011 · Synced Sep 10, 2026, 8:14 AM EDT
Recruiting Phase 2 Interventional

Intravenous L-Citrulline for Vaso-occlusive Pain Episode in Sickle Cell Disease

NCT06635902
View directory record Official record
Conditions
Sickle Cell Disease, Vaso-occlusive Pain Episode
Interventions
L-citrulline, Placebo
Drug · Other
Lead sponsor
Suvankar Majumdar
Other
Eligibility
4 Years to 21 Years
Enrollment
99 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2029
U.S. locations
1
States / cities
Washington D.C., District of Columbia
Source: ClinicalTrials.gov public record
Updated Apr 12, 2026 · Synced Sep 10, 2026, 8:14 AM EDT
Completed Phase 2 Interventional Results available

Intravenous L-Citrulline Influence on the Need for Invasive Mechanical Ventilation for Acute Hypoxemic Respiratory Failure in Patients With COVID-19

NCT04570384
View directory record Official record
Conditions
Acute Hypoxemic Respiratory Failure
Interventions
L-Citrulline, Placebo
Drug
Lead sponsor
Asklepion Pharmaceuticals, LLC
Industry
Eligibility
18 Years to 65 Years
Enrollment
65 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2021
U.S. locations
1
States / cities
Little Rock, Arkansas
Source: ClinicalTrials.gov public record
Updated Feb 21, 2023 · Synced Sep 10, 2026, 8:14 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

The Effect of 4 Weeks of L-Citrulline Supplementation on Macro- and Microvascular Function in Type 2 Diabetes

NCT06016478
View directory record Official record
Conditions
Type 2 Diabetes
Interventions
L-citrulline, Placebo
Dietary Supplement
Lead sponsor
Texas Tech University
Other
Eligibility
40 Years to 75 Years
Enrollment
36 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2024
U.S. locations
1
States / cities
Lubbock, Texas
Source: ClinicalTrials.gov public record
Updated May 14, 2025 · Synced Sep 10, 2026, 8:14 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Method To Measure Protein Digestion & Absorption

NCT02065141
View directory record Official record
Conditions
Chronic Heart Failure, Pulmonary Disorder, Chronic Obstructive
Interventions
sip feeding with stable isotope infusion
Other
Lead sponsor
Texas A&M University
Other
Eligibility
20 Years and older
Enrollment
74 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014 – 2019
U.S. locations
1
States / cities
College Station, Texas
Source: ClinicalTrials.gov public record
Updated Feb 6, 2022 · Synced Sep 10, 2026, 8:14 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Effects of Combined Grape Seed Extract and L-citrulline Supplementation on Hemodynamic Responses in Young Males

NCT05116150
View directory record Official record
Conditions
Dietary Supplementation
Interventions
Grape seed extract, Placebo
Dietary Supplement
Lead sponsor
California Baptist University
Other
Eligibility
18 Years to 30 Years · Male only
Enrollment
11 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019
U.S. locations
1
States / cities
Riverside, California
Source: ClinicalTrials.gov public record
Updated Nov 9, 2021 · Synced Sep 10, 2026, 8:14 AM EDT