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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 Phase 1 Interventional Results available

A Dose Escalation Study of Intravenous L-citrulline in Steady-state Sickle Cell Disease

NCT02314689
View directory record Official record
Conditions
Sickle Cell Disease
Interventions
Intravenous (IV) citrulline
Drug
Lead sponsor
Suvankar Majumdar
Other
Eligibility
18 Years to 25 Years
Enrollment
4 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015
U.S. locations
1
States / cities
Jackson, Mississippi
Source: ClinicalTrials.gov public record
Updated Sep 2, 2019 · Synced Sep 3, 2026, 5:51 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Dose-response Enteral Citrulline for Normal Healthy Volunteers and Surgery Patients

NCT00950976
View directory record Official record
Conditions
Nutritional Deficiency
Interventions
citrulline, Lemonade
Other
Lead sponsor
Société des Produits Nestlé (SPN)
Industry
Eligibility
18 Years and older
Enrollment
14 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008 – 2010
U.S. locations
1
States / cities
Pittsburgh, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Apr 24, 2012 · Synced Sep 3, 2026, 5:51 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 3, 2026, 5:51 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Omics Profiling of Weight Loss With Bariatric Surgery

NCT02757638
View directory record Official record
Conditions
Obesity, Surgery
Interventions
Stable isotope infusion
Other
Lead sponsor
Texas A&M University
Other
Eligibility
18 Years and older
Enrollment
7 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2018
U.S. locations
1
States / cities
College Station, Texas
Source: ClinicalTrials.gov public record
Updated Sep 29, 2025 · Synced Sep 3, 2026, 5:51 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Nutritional Strategies to Augment the Postprandial Muscle Protein Synthetic Response to the Ingestion of a Low Dose of Protein in Middle-aged Women

NCT02918981
View directory record Official record
Conditions
Aging
Interventions
Resistance Exercise, 14 g Whey protein, 6.6 g Whey protein + 1.25 g leucine, 4 g Whey protein + 1.25 g leucine + 2.6 g Whey peptides, 6.6 g Whey protein + 1.25 g leucine + 0.8 g Citrulline, Water control
Behavioral · Dietary Supplement · Other
Lead sponsor
University of Illinois at Urbana-Champaign
Other
Eligibility
20 Years to 79 Years · Female only
Enrollment
50 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2019
U.S. locations
1
States / cities
Urbana, Illinois
Source: ClinicalTrials.gov public record
Updated Nov 2, 2020 · Synced Sep 3, 2026, 5:51 AM 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 3, 2026, 5:51 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 29, 2019 · Synced Sep 3, 2026, 5:51 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Metabolic Processes in Adults and Adolescents With Autism Spectrum Disorder

NCT02733120
View directory record Official record
Conditions
Autism Spectrum Disorder
Interventions
stable isotope infusion
Other
Lead sponsor
Texas A&M University
Other
Eligibility
16 Years and older
Enrollment
40 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2017
U.S. locations
1
States / cities
College Station, Texas
Source: ClinicalTrials.gov public record
Updated Sep 29, 2025 · Synced Sep 3, 2026, 5:51 AM 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 3, 2026, 5:51 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 9, 2025 · Synced Sep 3, 2026, 5:51 AM 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 3, 2026, 5:51 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 18, 2024 · Synced Sep 3, 2026, 5:51 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 25, 2018 · Synced Sep 3, 2026, 5:51 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 3, 2026, 5:51 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 3, 2026, 5:51 AM EDT
Withdrawn Phase 1 Interventional

A Study of Oral L-citrulline in Sickle Cell Disease

NCT02659644
View directory record Official record
Conditions
Sickle Cell Disease
Interventions
Oral L-citrulline
Drug
Lead sponsor
University of Mississippi Medical Center
Other
Eligibility
10 Years to 25 Years
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2017
U.S. locations
1
States / cities
Jackson, Mississippi
Source: ClinicalTrials.gov public record
Updated Jun 20, 2018 · Synced Sep 3, 2026, 5:51 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 19, 2015 · Synced Sep 3, 2026, 5:51 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Citrulline Supplementation On Vascular Responsiveness and Function in Postmenopausal Women

NCT05600413
View directory record Official record
Conditions
Menopause
Interventions
L-Citrulline, Placebo
Dietary Supplement
Lead sponsor
Texas Tech University
Other
Eligibility
50 Years to 79 Years · Female only
Enrollment
26 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2022
U.S. locations
1
States / cities
Lubbock, Texas
Source: ClinicalTrials.gov public record
Updated Oct 30, 2022 · Synced Sep 3, 2026, 5:51 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 5, 2023 · Synced Sep 3, 2026, 5:51 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 3, 2026, 5:51 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

The Effects of a Dietary Supplement on Exercise Performance in Healthy Older Adults"

NCT01073332
View directory record Official record
Conditions
Excessive Physical Exercise, Unspecified
Interventions
Arginine antioxidant supplements, Placebo
Dietary Supplement
Lead sponsor
University of California, Los Angeles
Other
Eligibility
50 Years to 75 Years
Enrollment
16 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2004 – 2005
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated May 7, 2015 · Synced Sep 3, 2026, 5:51 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 3, 2026, 5:51 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 3, 2026, 5:51 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 29, 2019 · Synced Sep 3, 2026, 5:51 AM EDT