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Showing 25–48 of 24 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: leucine Clear all
Completed Not applicable Interventional Accepts healthy volunteers

Dileucine and Resistance Training Adaptations

NCT06121869
View directory record Official record
Conditions
Hypertrophy, Strength Training Adaptations, Weight-Bearing Strengthening Program
Interventions
Placebo, Leucine, Dileucine
Dietary Supplement
Lead sponsor
Lindenwood University
Other
Eligibility
18 Years to 39 Years · Male only
Enrollment
34 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2023
U.S. locations
1
States / cities
Saint Charles, Missouri
Source: ClinicalTrials.gov public record
Updated Nov 7, 2023 · Synced Sep 22, 2026, 4:16 PM EDT
Completed Early Phase 1 Interventional Accepts healthy volunteers

18F-Fluciclovine PET/CT in the Assessment of Pancreatic Transplants

NCT04852523
View directory record Official record
Conditions
Pancreatitis, Graft, Pancreatic Transplant Post-Transplant Dysfunction Rejection
Interventions
18F-fluciclovine
Drug
Lead sponsor
University of Utah
Other
Eligibility
18 Years and older
Enrollment
4 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2022
U.S. locations
1
States / cities
Salt Lake City, Utah
Source: ClinicalTrials.gov public record
Updated Sep 2, 2024 · Synced Sep 22, 2026, 4:16 PM EDT
Completed Not applicable Interventional

Effects of Nutritional Supplementation (Product 4808) on Acute Skeletal Muscle Protein Synthesis in Cancer Patients

NCT00446888
View directory record Official record
Conditions
Cancer
Interventions
Standardized Meals for Diet Stabilization, Forticare, Product 4808
Behavioral · Dietary Supplement
Lead sponsor
University of Arkansas
Other
Eligibility
40 Years and older
Enrollment
35 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2009
U.S. locations
1
States / cities
Little Rock, Arkansas
Source: ClinicalTrials.gov public record
Updated Jun 18, 2009 · Synced Sep 22, 2026, 4:16 PM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Prandial Metabolic Phenotype in Adults

NCT05400733
View directory record Official record
Conditions
Protein Metabolism
Interventions
Total Amino Acids, Essential Amino Acids, Essential Amino Acids + Hydroxy-methylbutyric acid (HMB), Essential Amino Acids + Leucine, Essential Amino Acids High, Placebo Water
Dietary Supplement
Lead sponsor
Texas A&M University
Other
Eligibility
60 Years to 80 Years
Enrollment
50 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2026
U.S. locations
1
States / cities
College Station, Texas
Source: ClinicalTrials.gov public record
Updated Sep 30, 2025 · Synced Sep 22, 2026, 4:16 PM EDT
Completed Phase 2 Interventional Results available

Dose Comparisons of Leucine-Metformin Combinations on Blood Glucose Levels In Type 2 Diabetic Patients

NCT02151461
View directory record Official record
Conditions
Type 2 Diabetes Mellitus
Interventions
Low Metformin, Metformin, Mid Metformin, High Metformin
Drug
Lead sponsor
NuSirt Biopharma
Industry
Eligibility
18 Years and older
Enrollment
96 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2016
U.S. locations
9
States / cities
Chino, California • Palm Beach, Florida • Tampa, Florida + 5 more
Source: ClinicalTrials.gov public record
Updated Feb 26, 2018 · Synced Sep 22, 2026, 4:16 PM EDT
Completed Phase 2 Interventional Results available

N-Acetyl-L-Leucine for GM2 Gangliosidosis (Tay-Sachs and Sandhoff Disease)

NCT03759665
View directory record Official record
Conditions
GM2 Gangliosidosis, Tay-Sachs Disease, Sandhoff Disease
Interventions
IB1001
Drug
Lead sponsor
IntraBio Inc
Industry
Eligibility
6 Years and older
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2023
U.S. locations
3
States / cities
Los Angeles, California • Rochester, Minnesota • New York, New York
Source: ClinicalTrials.gov public record
Updated Mar 11, 2024 · Synced Sep 22, 2026, 4:16 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

A Study to Investigate the Relative Bioavailability of AZD8630 Following a Device and Formulation Transition in Healthy Participants.

NCT06531811
View directory record Official record
Conditions
Healthy Participants
Interventions
AZD8630 (test formulation) via test inhaler, AZD8630 (reference formulation) via Monodose inhaler, Test inhaler, Monodose inhaler
Drug · Device
Lead sponsor
AstraZeneca
Industry
Eligibility
18 Years to 55 Years
Enrollment
32 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Oct 16, 2024 · Synced Sep 22, 2026, 4:16 PM EDT
Completed Not applicable Interventional Results available

The Role of Serotonin in Hot Flashes After Breast Cancer

NCT00228943
View directory record Official record
Conditions
Breast Cancer
Interventions
Acute tryptophan depletion, Half-strength tryptophan depletion (Control)
Dietary Supplement
Lead sponsor
Indiana University
Other
Eligibility
18 Years and older · Female only
Enrollment
28 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2005 – 2008
U.S. locations
1
States / cities
Indianapolis, Indiana
Source: ClinicalTrials.gov public record
Updated Apr 13, 2015 · Synced Sep 22, 2026, 4:16 PM EDT
Completed No phase listed Observational

PROGENI (Parkinson's Research: The Organized Genetics Initiative) Family Study of LRRK2 (Leucine-rich Repeat Kinase 2)

NCT01536821
View directory record Official record
Conditions
Parkinson Disease
Interventions
Not listed
Lead sponsor
Indiana University
Other
Eligibility
18 Years and older
Enrollment
81 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2013
U.S. locations
9
States / cities
Weston, Florida • Indianapolis, Indiana • Iowa City, Iowa + 6 more
Source: ClinicalTrials.gov public record
Updated Dec 15, 2013 · Synced Sep 22, 2026, 4:16 PM EDT
Terminated No phase listed Observational Accepts healthy volunteers

A Natural History Study of Patients With G2019S LRRK2 Parkinson's Disease

NCT05349019
View directory record Official record
Conditions
Patients With Parkinson's Disease (PD) Caused by the p.Gly2019Ser (G2019S) Pathogenic Mutation of the Leucine-Rich Repeat Kinase 2 (LRRK2) Gene
Interventions
Observational
Other
Lead sponsor
Escape Bio, Inc.
Industry
Eligibility
18 Years to 80 Years
Enrollment
22 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022
U.S. locations
1
States / cities
Culver City, California
Source: ClinicalTrials.gov public record
Updated Jan 17, 2023 · Synced Sep 22, 2026, 4:16 PM EDT
Completed Phase 1Phase 2 Interventional Results available

Hydroxyproline Influence on Oxalate Metabolism

NCT02038543
View directory record Official record
Conditions
Hyperoxaluria
Interventions
Hydroxyproline and Leucine
Drug
Lead sponsor
Mayo Clinic
Other
Eligibility
15 Years to 65 Years
Enrollment
22 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2017
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Jul 1, 2017 · Synced Sep 22, 2026, 4:16 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Dietary Intake and Circulating Levels of Branched Chain Amino Acids

NCT02110602
View directory record Official record
Conditions
Dietary Intake of Branched Chain Amino Acids
Interventions
Diet high in amino acid levels, Diet low in amino acid levels
Other
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
20 Years to 40 Years · Male only
Enrollment
5 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Oct 6, 2016 · Synced Sep 22, 2026, 4:16 PM 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 22, 2026, 4:16 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Vitamin B6 Dependence of One-Carbon Metabolism

NCT00877812
View directory record Official record
Conditions
Vitamin B6 Deficiency
Interventions
Arm 1 glycine and leucine, Arm 2 Intervention of Serine and methionine infusion
Dietary Supplement
Lead sponsor
University of Florida
Other
Eligibility
20 Years to 40 Years
Enrollment
45 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008 – 2010
U.S. locations
1
States / cities
Gainesville, Florida
Source: ClinicalTrials.gov public record
Updated Mar 26, 2013 · Synced Sep 22, 2026, 4:16 PM EDT
Terminated Early Phase 1 Interventional Accepts healthy volunteers Results available

Leucine for Depression Study (L-DEP)

NCT03557684
View directory record Official record
Conditions
Depression
Interventions
leucine, PO placebo, lipopolysaccharide (LPS), IV placebo
Dietary Supplement · Other · Biological
Lead sponsor
University of California, Los Angeles
Other
Eligibility
18 Years to 65 Years
Enrollment
59 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2021
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Jun 7, 2023 · Synced Sep 22, 2026, 4:16 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Regulation of Branched-chain Amino Acid Metabolism in Pre-Diabetes

NCT01786941
View directory record Official record
Conditions
Branched-chain Amino Acid Metabolism, Insulin Sensitivity
Interventions
Pre-Diabetes Group - 6-mo Aerobic and Resistance combined exercise training, GBP Group - Non-diabetics intending to undergo Gastric Bypass surgery
Other
Lead sponsor
Duke University
Other
Eligibility
30 Years to 65 Years
Enrollment
132 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2013
U.S. locations
1
States / cities
Durham, North Carolina
Source: ClinicalTrials.gov public record
Updated Oct 18, 2015 · Synced Sep 22, 2026, 4:16 PM EDT
Completed Phase 2 Interventional Results available

The Effect Of NS-0200 Versus Placebo On Hepatic Fat Content In Patients With Non Alcoholic Fatty Liver Disease

NCT02546609
View directory record Official record
Conditions
NAFLD
Interventions
Leu-Met-Sil 0.5, Leu-Met-Sil 1.0, Placebo
Drug
Lead sponsor
NuSirt Biopharma
Industry
Eligibility
18 Years to 75 Years
Enrollment
91 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2017
U.S. locations
13
States / cities
Chino, California • San Diego, California • Wheat Ridge, Colorado + 10 more
Source: ClinicalTrials.gov public record
Updated May 1, 2018 · Synced Sep 22, 2026, 4:16 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

The Effects of Leucine on Body Weight

NCT00683826
View directory record Official record
Conditions
Overweight, Obesity
Interventions
L-Leucine 8gr, Liquid meal, L-Leucine 4g
Dietary Supplement · Other
Lead sponsor
Columbia University
Other
Eligibility
18 Years to 65 Years
Enrollment
8 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2007 – 2010
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Mar 4, 2013 · Synced Sep 22, 2026, 4:16 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Muscle Protein Synthesis in Dialysis Patients

NCT03478722
View directory record Official record
Conditions
Muscle Loss
Interventions
Protein Meal, Stable Isotope Amino Acid Infusion
Other
Lead sponsor
University of Illinois at Urbana-Champaign
Other
Eligibility
20 Years to 80 Years
Enrollment
16 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2018
U.S. locations
1
States / cities
Urbana, Illinois
Source: ClinicalTrials.gov public record
Updated Apr 30, 2018 · Synced Sep 22, 2026, 4:16 PM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Leucine Enriched Essential Amino Acid Mixture to Reverse Muscle Loss in Cirrhosis

NCT03208868
View directory record Official record
Conditions
Cirrhosis, Liver
Interventions
Leucine enriched essential amino acid (EEA/LEU), Balanced amino acid supplement (BAA)
Dietary Supplement
Lead sponsor
The Cleveland Clinic
Other
Eligibility
18 Years to 70 Years
Enrollment
32 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2028
U.S. locations
1
States / cities
Cleveland, Ohio
Source: ClinicalTrials.gov public record
Updated Aug 20, 2026 · Synced Sep 22, 2026, 4:16 PM EDT
Completed Phase 3 Interventional Results available

SYD985 vs. Physician's Choice in Participants With HER2-positive Locally Advanced or Metastatic Breast Cancer

NCT03262935
View directory record Official record
Conditions
Metastatic Breast Cancer
Interventions
(vic-)trastuzumab duocarmazine, Physician's choice
Drug
Lead sponsor
Byondis B.V.
Industry
Eligibility
18 Years and older · Female only
Enrollment
437 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2022
U.S. locations
23
States / cities
Mobile, Alabama • Tucson, Arizona • San Diego, California + 17 more
Source: ClinicalTrials.gov public record
Updated Oct 18, 2023 · Synced Sep 22, 2026, 4:16 PM EDT
Completed Phase 2 Interventional Results available

Mechanistic Approach to Preventing Atrophy and Restoring Function in Older Adults

NCT02145949
View directory record Official record
Conditions
Muscle Atrophy, Quality of Life
Interventions
Essential Amino Acids (EAA), Placebo (Alanine)
Drug
Lead sponsor
University of Oregon
Other
Eligibility
50 Years to 80 Years
Enrollment
80 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2020
U.S. locations
2
States / cities
Eugene, Oregon
Source: ClinicalTrials.gov public record
Updated Jul 22, 2024 · Synced Sep 22, 2026, 4:16 PM EDT
Completed Phase 2 Interventional Results available

N-Acetyl-L-Leucine for Niemann-Pick Disease, Type C (NPC)

NCT03759639
View directory record Official record
Conditions
Niemann-Pick Disease, Type C
Interventions
IB1001
Drug
Lead sponsor
IntraBio Inc
Industry
Eligibility
6 Years and older
Enrollment
33 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2022
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Nov 27, 2023 · Synced Sep 22, 2026, 4:16 PM EDT
Completed Phase 2 Interventional Results available

An Extension Protocol to Evaluate Dose Comparisons of Leucine-Metformin Combinations in Type 2 Diabetic Patients

NCT02435277
View directory record Official record
Conditions
Type 2 Diabetes Mellitus
Interventions
Low Metformin, Mid Metformin, High Metformin, Metformin
Drug
Lead sponsor
NuSirt Biopharma
Industry
Eligibility
18 Years and older
Enrollment
50 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2016
U.S. locations
9
States / cities
Chino, California • Palm Beach, Florida • Tampa, Florida + 5 more
Source: ClinicalTrials.gov public record
Updated Jan 16, 2018 · Synced Sep 22, 2026, 4:16 PM EDT