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Showing 25–48 of 24 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: citrulline Clear all
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 22, 2026, 9:33 PM EDT
Not listed Not applicable Interventional Accepts healthy volunteers

Safety and Tolerability of 2 Dietary Supplement Beverages Designed to Maintain Healthy Blood Pressure.

NCT06442293
View directory record Official record
Conditions
Safety Issues, Tolerance
Interventions
Treatment 1, Treatment 2, Placebo
Dietary Supplement
Lead sponsor
USANA Health Sciences
Industry
Eligibility
18 Years to 50 Years
Enrollment
18 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024
U.S. locations
1
States / cities
Salt Lake City, Utah
Source: ClinicalTrials.gov public record
Updated Jun 3, 2024 · Synced Sep 22, 2026, 9:33 PM 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 22, 2026, 9:33 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Markers of Atherosclerosis in Overweight, Postmenopausal Women Following Daily Watermelon Consumption

NCT04015544
View directory record Official record
Conditions
Postmenopausal, Overweight and Obesity
Interventions
Watermelon
Dietary Supplement
Lead sponsor
Appalachian State University
Other
Eligibility
50 Years to 75 Years · Female only
Enrollment
52 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014
U.S. locations
1
States / cities
Boone, North Carolina
Source: ClinicalTrials.gov public record
Updated Jul 10, 2019 · Synced Sep 22, 2026, 9:33 PM 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 22, 2026, 9:33 PM 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 4, 2016 · Synced Sep 22, 2026, 9:33 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 22, 2026, 9:33 PM EDT
Completed Phase 1 Interventional

L-Citrulline Dose Finding Safety Study in MELAS

NCT03952234
View directory record Official record
Conditions
MELAS Syndrome
Interventions
L-Citrulline
Drug
Lead sponsor
Baylor College of Medicine
Other
Eligibility
18 Years to 65 Years
Enrollment
10 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2024
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Jun 25, 2024 · Synced Sep 22, 2026, 9:33 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 22, 2026, 9:33 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 22, 2026, 9:33 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 22, 2026, 9:33 PM 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 22, 2026, 9:33 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 22, 2026, 9:33 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 22, 2026, 9:33 PM 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 27, 2017 · Synced Sep 22, 2026, 9:33 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 22, 2026, 9:33 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 22, 2026, 9:33 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 22, 2026, 9:33 PM 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 22, 2026, 9:33 PM 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 21, 2018 · Synced Sep 22, 2026, 9:33 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 22, 2026, 9:33 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 22, 2026, 9:33 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 22, 2026, 9:33 PM 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 22, 2026, 9:33 PM EDT