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ClinicalTrials.gov public records Last synced Oct 17, 2026, 5:28 AM EDT

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Showing 1–24 of 73 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: L-Citrulline Clear all
Completed Not applicable Interventional Accepts healthy volunteers

Effects of L-citrulline Supplementation on Vascular Function in Metabolic Syndrome

NCT06025357
View directory record Official record
Conditions
Metabolic Syndrome, Menopause
Interventions
L-Citrulline supplementation, Placebo
Dietary Supplement
Lead sponsor
Texas Tech University
Other
Eligibility
45 Years to 79 Years · Female only
Enrollment
24 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2024
U.S. locations
1
States / cities
Lubbock, Texas
Source: ClinicalTrials.gov public record
Updated May 15, 2025 · Synced Oct 17, 2026, 5:28 AM 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 30, 2019 · Synced Oct 17, 2026, 5:28 AM 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 2, 2016 · Synced Oct 17, 2026, 5:28 AM EDT
Completed Phase 1Phase 2 Interventional

Watermelon Supplementation and Arterial Stiffness

NCT01185041
View directory record Official record
Conditions
Hypertension
Interventions
Watermelon Extract
Dietary Supplement
Lead sponsor
Florida State University
Other
Eligibility
45 Years to 70 Years
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2011
U.S. locations
1
States / cities
Tallahassee, Florida
Source: ClinicalTrials.gov public record
Updated Mar 20, 2012 · Synced Oct 17, 2026, 5:28 AM EDT
Terminated Early Phase 1 Interventional Results available

L-citrulline and Pulmonary Hypertension Associated With Bronchopulmonary Dysplasia

NCT03542812
View directory record Official record
Conditions
Infant,Premature, Bronchopulmonary Dysplasia, Pulmonary Hypertension
Interventions
L-Citrulline
Drug
Lead sponsor
University of Utah
Other
Eligibility
14 Days to 3 Months
Enrollment
16 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2022
U.S. locations
1
States / cities
Salt Lake City, Utah
Source: ClinicalTrials.gov public record
Updated Jun 10, 2024 · Synced Oct 17, 2026, 5:28 AM EDT
Completed Early Phase 1 Interventional Accepts healthy volunteers

Nitric Oxide Production in MELAS Syndrome

NCT01339494
View directory record Official record
Conditions
MELAS Syndrome
Interventions
Arginine and citrulline supplementations
Dietary Supplement
Lead sponsor
Baylor College of Medicine
Other
Eligibility
3 Years to 65 Years
Enrollment
30 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2009 – 2016
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Apr 5, 2016 · Synced Oct 17, 2026, 5:28 AM EDT
Withdrawn Not applicable Interventional Accepts healthy volunteers

Anabolic Response Cancer

NCT02793531
View directory record Official record
Conditions
Cancer
Interventions
Stable isotope amino acid infusion
Other
Lead sponsor
Texas A&M University
Other
Eligibility
18 Years and older
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2019
U.S. locations
1
States / cities
College Station, Texas
Source: ClinicalTrials.gov public record
Updated Mar 22, 2018 · Synced Oct 17, 2026, 5:28 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Safety Evaluation of a Diet and Nutritional Supplementation Program- Purify 2.0

NCT03685552
View directory record Official record
Conditions
Gastrointestinal Symptoms
Interventions
Prog: Purify-2
Other
Lead sponsor
Nature's Sunshine Products, Inc.
Industry
Eligibility
18 Years to 69 Years
Enrollment
38 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017
U.S. locations
1
States / cities
Lehi, Utah
Source: ClinicalTrials.gov public record
Updated Sep 26, 2018 · Synced Oct 17, 2026, 5:28 AM 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 29, 2022 · Synced Oct 17, 2026, 5:28 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Nitric Oxide Flux and Ureagenesis in Argininosuccinate Synthetase Deficiency (ASSD)(Citrullinemia I)

NCT01610089
View directory record Official record
Conditions
Citrullinemia
Interventions
stable isotope infusion
Other
Lead sponsor
Baylor College of Medicine
Other
Eligibility
18 Years and older
Enrollment
6 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2013
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Mar 20, 2015 · Synced Oct 17, 2026, 5:28 AM 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 19, 2024 · Synced Oct 17, 2026, 5:28 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 2, 2017 · Synced Oct 17, 2026, 5:28 AM 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 27, 2022 · Synced Oct 17, 2026, 5:28 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 13, 2026 · Synced Oct 17, 2026, 5:28 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 15, 2025 · Synced Oct 17, 2026, 5:28 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Effect of a Nitric Oxide Supplementation Product on Endothelial Dysfunction and Prehypertensive Adults

NCT03895749
View directory record Official record
Conditions
Hypertension
Interventions
NEO40 Daily
Dietary Supplement
Lead sponsor
Hypertension Institute, Nashville
Other
Eligibility
18 Years to 75 Years
Enrollment
42 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2018
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Oct 30, 2019 · Synced Oct 17, 2026, 5:28 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 25, 2019 · Synced Oct 17, 2026, 5:28 AM EDT
Not yet recruiting Phase 2 Interventional

Effect of Metabolic Modulation on a Post-acute COVID-19 Vaccination Syndrome (PACVS) Cohort

NCT06967428
View directory record Official record
Conditions
Vaccine Adverse Reaction, Post Acute Covid-19 Vaccination Syndrome
Interventions
Combined metabolic modulator, Rice Protein Powder with Vitamin C
Combination Product · Dietary Supplement
Lead sponsor
Independent Medical Alliance
Other
Eligibility
16 Years and older
Enrollment
100 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2026
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated May 13, 2025 · Synced Oct 17, 2026, 5:28 AM EDT
Terminated No phase listed Observational

Defining Normal Citrulline Levels as a Diagnostic Tool for Screening of Gastrointestinal Disease in Premature Infants

NCT01062828
View directory record Official record
Conditions
Premature Newborn, Necrotizing Enterocolitis
Interventions
Citrulline samples
Diagnostic Test
Lead sponsor
University of Miami
Other
Eligibility
Not listed
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2017
U.S. locations
1
States / cities
Miami, Florida
Source: ClinicalTrials.gov public record
Updated Aug 28, 2017 · Synced Oct 17, 2026, 5:28 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 27, 2020 · Synced Oct 17, 2026, 5:28 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 5, 2014 · Synced Oct 17, 2026, 5:28 AM 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 6, 2023 · Synced Oct 17, 2026, 5:28 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

The Objective of This Study Was to Compare and Quantify the Bioavailability of Citrulline Byproducts in Blood Samples and in Urine Samples After a Single Dose of the Assigned Dietary Supplement. The Treatment Arms Containing the Following Molecules: Citrulline HCL and L-Citrulline,

NCT06977854
View directory record Official record
Conditions
Bioavailability and AUC
Interventions
Removal from study. In case of adverse event, subject treated for the AE., removal from study
Other
Lead sponsor
Vireo Systems, Inc.
Industry
Eligibility
18 Years to 64 Years
Enrollment
32 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024
U.S. locations
1
States / cities
Raritan, New Jersey
Source: ClinicalTrials.gov public record
Updated May 18, 2025 · Synced Oct 17, 2026, 5:28 AM 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 10, 2025 · Synced Oct 17, 2026, 5:28 AM EDT