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Showing 1–24 of 25 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: Placebo for L-Citrulline Clear all
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 25, 2026, 7:38 PM 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 25, 2026, 7:38 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Oral L-Citrulline and ADMA in Pregnancy

NCT00743210
View directory record Official record
Conditions
Blood Pressure
Interventions
L-citrulline, Placebo
Drug
Lead sponsor
University of Pittsburgh
Other
Eligibility
14 Years to 40 Years · Female only
Enrollment
41 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2013
U.S. locations
1
States / cities
Pittsburgh, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Jul 15, 2014 · Synced Sep 25, 2026, 7:38 PM EDT
Completed Not applicable Interventional Results available

Glutamine and Insulin Sensitivity in Type I Diabetes

NCT01467063
View directory record Official record
Conditions
Type I Diabetes Mellitus
Interventions
Glutamine, Placebo
Dietary Supplement
Lead sponsor
Nemours Children's Clinic
Other
Eligibility
13 Years to 19 Years
Enrollment
13 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2013
U.S. locations
1
States / cities
Jacksonville, Florida
Source: ClinicalTrials.gov public record
Updated Jul 13, 2021 · Synced Sep 25, 2026, 7:38 PM EDT
Recruiting Phase 1 Interventional

Novel Approaches for Improving Vascular Function in Veterans With HFpEF

NCT06312748
View directory record Official record
Conditions
Heart Failure With Preserved Ejection Fraction, Inflammation
Interventions
L-Citrulline, Placebo for L-Citrulline, BH4, Placebo for BH4, Atorvastatin, Placebo for Atorvastatin
Drug
Lead sponsor
VA Office of Research and Development
Federal
Eligibility
18 Years and older
Enrollment
90 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2030
U.S. locations
1
States / cities
Salt Lake City, Utah
Source: ClinicalTrials.gov public record
Updated Apr 22, 2026 · Synced Sep 25, 2026, 7:38 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Effect of 4 Weeks of Citrulline and Glutathione Supplementation on Arterial Function

NCT04672447
View directory record Official record
Conditions
Menopause, Cardiovascular Risk Factor
Interventions
L-Citrulline, Placebo, Glutathione
Dietary Supplement
Lead sponsor
Texas Tech University
Other
Eligibility
50 Years to 79 Years · Female only
Enrollment
39 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2022
U.S. locations
1
States / cities
Lubbock, Texas
Source: ClinicalTrials.gov public record
Updated Oct 19, 2022 · Synced Sep 25, 2026, 7:38 PM EDT
Completed Phase 1Phase 2 Interventional Results available

Intravenous L-Citrulline to Treat Children Undergoing Heart Bypass Surgery : Revised Protocol

NCT01120964
View directory record Official record
Conditions
Atrial Septal Defect, Ventricular Septal Defect, Atrioventricular Septal Defect
Interventions
Intravenous L-Citrulline, Placebo of Intravenous L-Citrulline
Drug
Lead sponsor
Asklepion Pharmaceuticals, LLC
Industry
Eligibility
Up to 6 Years
Enrollment
22 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2012
U.S. locations
2
States / cities
St Louis, Missouri • Cincinnati, Ohio
Source: ClinicalTrials.gov public record
Updated Jul 26, 2022 · Synced Sep 25, 2026, 7:38 PM 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 25, 2026, 7:38 PM EDT
Completed Phase 2 Interventional Results available

Citrulline in Severe Sepsis

NCT01474863
View directory record Official record
Conditions
Severe Sepsis, Acute Lung Injury
Interventions
High Dose Citrulline, Placebo, Low Dose Citrulline
Drug
Lead sponsor
Vanderbilt University
Other
Eligibility
13 Years and older
Enrollment
72 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2016
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Jun 4, 2017 · Synced Sep 25, 2026, 7:38 PM EDT
Completed Phase 2 Interventional

Chemotherapy Toxicity Reduction Via Urea Cycle Support

NCT00223730
View directory record Official record
Conditions
Cancer
Interventions
Citrulline, Placebo
Drug
Lead sponsor
Vanderbilt University
Other
Eligibility
13 Years to 65 Years
Enrollment
100 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2001 – 2007
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Nov 1, 2016 · Synced Sep 25, 2026, 7:38 PM EDT
Completed Not applicable Interventional

Study of Arginine and Nitric Oxide in Patients With Diabetes

NCT03566524
View directory record Official record
Conditions
Ketosis Prone Diabetes
Interventions
Citrulline, Alanine
Dietary Supplement
Lead sponsor
Baylor College of Medicine
Other
Eligibility
20 Years to 65 Years
Enrollment
10 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2022
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Jul 28, 2022 · Synced Sep 25, 2026, 7:38 PM EDT
Completed Phase 3 Interventional Results available

L-citrulline for Prevention of Sequelae of Acute Lung Injury in Pediatrics Undergoing Cardiopulmonary Bypass for Heart Defects

NCT02891837
View directory record Official record
Conditions
Acute Lung Injury
Interventions
L-citrulline, Placebo
Drug · Other
Lead sponsor
Asklepion Pharmaceuticals, LLC
Industry
Eligibility
Up to 18 Years
Enrollment
189 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2019
U.S. locations
20
States / cities
Birmingham, Alabama • Loma Linda, California • Sacramento, California + 16 more
Source: ClinicalTrials.gov public record
Updated Feb 22, 2023 · Synced Sep 25, 2026, 7:38 PM EDT
Recruiting Phase 2 Interventional Accepts healthy volunteers

Supplementing L-citrulline to Overweight Late Asthma oNset Phenotypes

NCT03885245
View directory record Official record
Conditions
Asthma, Obesity
Interventions
L-ctirulline, Matching Placebo
Drug
Lead sponsor
University of Colorado, Denver
Other
Eligibility
18 Years to 65 Years
Enrollment
60 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2026
U.S. locations
1
States / cities
Durham, North Carolina
Source: ClinicalTrials.gov public record
Updated Jun 9, 2025 · Synced Sep 25, 2026, 7:38 PM 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 25, 2026, 7:38 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

A Study to Examine the Effect of a Thermogenic Energy Drink in Healthy Adults

NCT05061797
View directory record Official record
Conditions
Metabolism
Interventions
Thermogenic Energy Drink - Active Study Product Formula, Placebo
Dietary Supplement
Lead sponsor
Rowdy Energy
Industry
Eligibility
18 Years to 50 Years
Enrollment
30 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021
U.S. locations
1
States / cities
Addison, Illinois
Source: ClinicalTrials.gov public record
Updated May 1, 2022 · Synced Sep 25, 2026, 7:38 PM EDT
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 25, 2026, 7:38 PM EDT
Terminated Phase 3 Interventional

A Study Evaluating the Efficacy and Safety of IV L-Citrulline for the Prevention of Clinical Sequelae of Acute Lung Injury Induced by Cardiopulmonary Bypass in Pediatric Patients Undergoing Surgery for Congenital Heart Defects

NCT05253209
View directory record Official record
Conditions
Ventricular Septal Defect, Atrioventricular Septal Defect, Primum Atrial Septal Defect
Interventions
L-citrulline, Plasmalyte A
Drug
Lead sponsor
Asklepion Pharmaceuticals, LLC
Industry
Eligibility
Up to 18 Years
Enrollment
64 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2024
U.S. locations
10
States / cities
Birmingham, Alabama • Aurora, Colorado • Chicago, Illinois + 7 more
Source: ClinicalTrials.gov public record
Updated Sep 18, 2024 · Synced Sep 25, 2026, 7:38 PM EDT
Terminated Not applicable Interventional

Nutraceutical Citrulline in Pregnancy

NCT02772887
View directory record Official record
Conditions
Type 2 Diabetes
Interventions
L-Citrulline, Placebo
Dietary Supplement · Other
Lead sponsor
University of Pittsburgh
Other
Eligibility
14 Years to 40 Years · Female only
Enrollment
8 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2019
U.S. locations
1
States / cities
Pittsburgh, Pennsylvania
Source: ClinicalTrials.gov public record
Updated May 29, 2019 · Synced Sep 25, 2026, 7:38 PM EDT
Not yet recruiting Phase 3 Interventional

A Study of Intravenous L-Citrulline in Patients Aged 6-21 Years Old With Sickle Cell Disease Presenting to Emergency Departments in Acute Vaso-Occlusive Crisis

NCT06989567
View directory record Official record
Conditions
Sickle Cell Disease
Interventions
L-citrulline, Placebo
Drug · Other
Lead sponsor
Asklepion Pharmaceuticals, LLC
Industry
Eligibility
6 Years to 21 Years
Enrollment
120 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2029
U.S. locations
6
States / cities
Washington D.C., District of Columbia • Coral Gables, Florida • Atlanta, Georgia + 3 more
Source: ClinicalTrials.gov public record
Updated May 28, 2025 · Synced Sep 25, 2026, 7:38 PM 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 25, 2026, 7:38 PM EDT
Terminated Early Phase 1 Interventional Accepts healthy volunteers Results available

Vascular Dysfunction in Black Individuals: Roles of Nitric Oxide and Endothelin-1

NCT04770155
View directory record Official record
Conditions
Vascular Function, Racial Disparity
Interventions
Dietary Nitrates 400 mg, L-citrulline 3 g, Sildenafil 100 mg, Bosentan 125 mg
Dietary Supplement · Drug
Lead sponsor
University of Mississippi Medical Center
Other
Eligibility
18 Years to 40 Years
Enrollment
8 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021
U.S. locations
1
States / cities
Jackson, Mississippi
Source: ClinicalTrials.gov public record
Updated Oct 30, 2023 · Synced Sep 25, 2026, 7:38 PM 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 25, 2026, 7:38 PM 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 25, 2026, 7:38 PM EDT
Recruiting Phase 2 Interventional

Study to Improve Deployment Related Asthma by Using L-Citrulline Supplementation

NCT05259904
View directory record Official record
Conditions
Post Deployment Related Asthma, Asthma
Interventions
L-citrulline, Placebo
Drug
Lead sponsor
University of Colorado, Denver
Other
Eligibility
18 Years to 70 Years
Enrollment
75 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2028
U.S. locations
1
States / cities
Denver, Colorado
Source: ClinicalTrials.gov public record
Updated Apr 5, 2023 · Synced Sep 25, 2026, 7:38 PM EDT