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Showing 1–24 of 72 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: L-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 1, 2026, 4:00 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 1, 2026, 4:00 PM 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 1, 2026, 4:00 PM 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 1, 2026, 4:00 PM EDT
Recruiting Not applicable Interventional

Effect of Watermelon on Gut and Cardiometabolic Health

NCT06588218
View directory record Official record
Conditions
Obesity and Overweight, Dysbiosis
Interventions
Watermelon, Belvita Breakfast Sandwich + 12 oz Water
Other
Lead sponsor
Florida State University
Other
Eligibility
18 Years to 30 Years
Enrollment
36 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2026
U.S. locations
1
States / cities
Tallahassee, Florida
Source: ClinicalTrials.gov public record
Updated Apr 8, 2026 · Synced Sep 1, 2026, 4:00 PM 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 1, 2026, 4:00 PM EDT
Completed Phase 1Phase 2 Interventional

Citrulline for Children Undergoing Cardiopulmonary Bypass Surgery

NCT00201214
View directory record Official record
Conditions
Cardiovascular Diseases, Heart Diseases, Heart Defects, Congenital
Interventions
Citrulline
Drug
Lead sponsor
Vanderbilt University
Other
Eligibility
Up to 18 Years
Enrollment
26 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2003 – 2009
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Sep 11, 2013 · Synced Sep 1, 2026, 4:00 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 1, 2026, 4:00 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 1, 2026, 4:00 PM EDT
Completed Phase 1Phase 2 Interventional Accepts healthy volunteers

COMP-4 Supplementation and Brachial Artery FMD

NCT05595915
View directory record Official record
Conditions
Aging, Endothelial Dysfunction, Senescence
Interventions
COMP-4
Dietary Supplement
Lead sponsor
University of California, Los Angeles
Other
Eligibility
18 Years to 39 Years
Enrollment
32 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2025
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Mar 8, 2026 · Synced Sep 1, 2026, 4:00 PM 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 1, 2026, 4:00 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 1, 2026, 4:00 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 1, 2026, 4:00 PM 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 1, 2026, 4:00 PM EDT
Active, not recruiting Phase 1Phase 2 Interventional Accepts healthy volunteers

Effect of a Daily Supplement on Plasma PAI-1 Levels

NCT07469475
View directory record Official record
Conditions
Aging, Endothelial Dysfunction, Senescence
Interventions
Supplement with ginger extract, L-citrulline, Paullinia cupana, and muira puama
Dietary Supplement
Lead sponsor
University of California, Los Angeles
Other
Eligibility
18 Years and older
Enrollment
35 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2026
U.S. locations
2
States / cities
Los Angeles, California • Santa Monica, California
Source: ClinicalTrials.gov public record
Updated Jun 24, 2026 · Synced Sep 1, 2026, 4:00 PM 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 1, 2026, 4:00 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 1, 2026, 4:00 PM 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 1, 2026, 4:00 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

L-Citrulline and Endothelial Function

NCT05722860
View directory record Official record
Conditions
Aging
Interventions
L-Citrulline, capsule
Drug
Lead sponsor
University of Oklahoma
Other
Eligibility
18 Years to 90 Years
Enrollment
20 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024
U.S. locations
1
States / cities
Oklahoma City, Oklahoma
Source: ClinicalTrials.gov public record
Updated Mar 11, 2026 · Synced Sep 1, 2026, 4:00 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 1, 2026, 4:00 PM 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 17, 2025 · Synced Sep 1, 2026, 4:00 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 1, 2026, 4:00 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 1, 2026, 4:00 PM 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 1, 2026, 4:00 PM EDT