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Showing 1–24 of 42 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: Essential Amino Acids + Leucine Clear all
Completed Not applicable Interventional

EAA Intake to Optimize Protein Anabolism in COPD

NCT01173354
View directory record Official record
Conditions
Chronic Obstructive Pulmonary Disease
Interventions
Free balanced amino acid mixture, Free essential amino acid mixture
Dietary Supplement
Lead sponsor
Texas A&M University
Other
Eligibility
45 Years and older
Enrollment
34 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2012
U.S. locations
1
States / cities
Little Rock, Arkansas
Source: ClinicalTrials.gov public record
Updated Sep 29, 2025 · Synced Sep 1, 2026, 8:12 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Oral Supplement and Acute Resistance Exercise

NCT06801951
View directory record Official record
Conditions
Chronic Obstructive Pulmonary Disease
Interventions
acute resistance exercise with oral nutrition supplementation, stable tracer infusion
Other
Lead sponsor
Texas A&M University
Other
Eligibility
45 Years to 100 Years
Enrollment
16 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2020
U.S. locations
1
States / cities
College Station, Texas
Source: ClinicalTrials.gov public record
Updated Jan 29, 2025 · Synced Sep 1, 2026, 8:12 PM EDT
Recruiting Phase 2 Interventional

Essential Amino Acid Supplementation for Femoral Fragility Fractures

NCT06050668
View directory record Official record
Conditions
Femoral Fracture, Fragility Fracture, Muscle Atrophy
Interventions
Essential Amino Acid Supplementation
Combination Product
Lead sponsor
Michael C Willey
Other
Eligibility
65 Years and older
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2026
U.S. locations
2
States / cities
Iowa City, Iowa • Eugene, Oregon
Source: ClinicalTrials.gov public record
Updated Apr 14, 2026 · Synced Sep 1, 2026, 8:12 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 1, 2026, 8:12 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 1, 2026, 8:12 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Estrogen and Serotonin on Changing Brain Chemistry

NCT01208324
View directory record Official record
Conditions
Menopause
Interventions
estrogen patch, Amino acids, Placebo Patch, Placebo pills
Drug
Lead sponsor
University of Colorado, Denver
Other
Eligibility
48 Years to 60 Years · Female only
Enrollment
47 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2018
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Apr 1, 2021 · Synced Sep 1, 2026, 8:12 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Casein Protein and Leucine Supplementation in Chronic Obstructive Pulmonary Disease (COPD)

NCT01734473
View directory record Official record
Conditions
COPD
Interventions
Hydrolyzed casein protein, Hydrolyzed casein protein + carbohydrates, Hydrolyzed casein protein + leucine, Hydrolyzed casein protein + carbohydrates + leucine, 4 levels of hydrolyzed casein protein + carbohydrates
Dietary Supplement
Lead sponsor
Texas A&M University
Other
Eligibility
45 Years and older
Enrollment
36 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2015
U.S. locations
1
States / cities
College Station, Texas
Source: ClinicalTrials.gov public record
Updated Sep 29, 2025 · Synced Sep 1, 2026, 8:12 PM EDT
Terminated No phase listed Observational Accepts healthy volunteers

Study of Metabolic Effects of Pregnancy in Women With Cystic Fibrosis

NCT00014768
View directory record Official record
Conditions
Cystic Fibrosis
Interventions
glucose, insulin, leucine
Drug
Lead sponsor
National Center for Research Resources (NCRR)
NIH
Eligibility
0 Years and older · Female only
Enrollment
36 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
Started 2001
U.S. locations
1
States / cities
Salt Lake City, Utah
Source: ClinicalTrials.gov public record
Updated Jun 23, 2005 · Synced Sep 1, 2026, 8:12 PM EDT
Recruiting Not applicable Interventional

Study of HMB-enriched Amino Acid Supplementation in Patients With Alcoholic Liver Disease and COVID-19

NCT04858412
View directory record Official record
Conditions
Alcoholic Liver Disease, COVID 19 Pneumonia
Interventions
β-hydroxy β-methyl butyrate (HMB) enriched amino acid, Balanced amino acid
Dietary Supplement
Lead sponsor
The Cleveland Clinic
Other
Eligibility
21 Years and older
Enrollment
48 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2026
U.S. locations
1
States / cities
Cleveland, Ohio
Source: ClinicalTrials.gov public record
Updated Nov 24, 2025 · Synced Sep 1, 2026, 8:12 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 1, 2026, 8:12 PM EDT
Recruiting Phase 2 Interventional

SMART Diets for MASLD

NCT07459504
View directory record Official record
Conditions
Metabolic-dysfunction Associated Steatotic Liver Disease
Interventions
Essential Amino Acids Supplementation intervention, Low sugar diet
Drug · Other
Lead sponsor
Michigan State University
Other
Eligibility
11 Years to 17 Years
Enrollment
102 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2030
U.S. locations
1
States / cities
Grand Rapids, Michigan
Source: ClinicalTrials.gov public record
Updated May 31, 2026 · Synced Sep 1, 2026, 8:12 PM EDT
Terminated Not applicable Interventional Accepts healthy volunteers Results available

Pharmacotoxicology of Trichloroethylene Metabolites

NCT00865514
View directory record Official record
Conditions
Healthy
Interventions
Dichloroacetate, Genotyping, Leucine, tyrosine
Drug · Genetic · Other
Lead sponsor
University of Florida
Other
Eligibility
22 Years to 60 Years
Enrollment
2 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2012
U.S. locations
1
States / cities
Gainesville, Florida
Source: ClinicalTrials.gov public record
Updated Jun 2, 2015 · Synced Sep 1, 2026, 8:12 PM EDT
Not listed Not applicable Interventional

Gluconeogenesis in Very Low Birth Weight Infants Who Are Receiving Nutrition By Intravenous Infusion

NCT00005889
View directory record Official record
Conditions
Infant, Low Birth Weight, Hyperglycemia
Interventions
alanine, amino acids, glucagon, glucose, glutamine, glycerol, insulin, leucine, lipids, urea
Drug
Lead sponsor
National Center for Research Resources (NCRR)
NIH
Eligibility
4 Days to 6 Days
Enrollment
96 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
Started 1999
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Jun 23, 2005 · Synced Sep 1, 2026, 8:12 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Preserving Muscle Mass and Function in Bedridden Older Adults

NCT01846130
View directory record Official record
Conditions
Bed Rest
Interventions
Leucine, Exercise, Whey protein
Dietary Supplement · Behavioral
Lead sponsor
The University of Texas Medical Branch, Galveston
Other
Eligibility
60 Years to 80 Years
Enrollment
123 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2018
U.S. locations
1
States / cities
Galveston, Texas
Source: ClinicalTrials.gov public record
Updated Jan 23, 2019 · Synced Sep 1, 2026, 8:12 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 1, 2026, 8:12 PM EDT
Completed Not applicable Interventional

Hydrolyzed Casein and Whey Protein Supplementation and the Addition of Leucine to Induce Protein Anabolism in Malnourished COPD Patients

NCT01154400
View directory record Official record
Conditions
Chronic Obstructive Pulmonary Disease
Interventions
Casein protein hydrolysates, Whey protein hydrolysates, Casein protein hydrolysates + LEU, Whey protein hydrolysates + LEU
Dietary Supplement
Lead sponsor
Texas A&M University
Other
Eligibility
45 Years and older
Enrollment
12 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2011
U.S. locations
1
States / cities
Little Rock, Arkansas
Source: ClinicalTrials.gov public record
Updated Oct 14, 2012 · Synced Sep 1, 2026, 8:12 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Metabolic Effects of Perimenopause

NCT06098183
View directory record Official record
Conditions
Perimenopausal Disorder
Interventions
Whey Protein Isolate, Non-caloric Placebo water
Other
Lead sponsor
University of North Carolina, Chapel Hill
Other
Eligibility
38 Years to 60 Years · Female only
Enrollment
28 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2025
U.S. locations
1
States / cities
Chapel Hill, North Carolina
Source: ClinicalTrials.gov public record
Updated Sep 10, 2025 · Synced Sep 1, 2026, 8:12 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Muscle Regrowth During Physical Rehabilitation and Amino Acid Supplementation

NCT00760383
View directory record Official record
Conditions
Osteoarthritis
Interventions
Essential amino acids, Alanine
Dietary Supplement
Lead sponsor
University of Oregon
Other
Eligibility
60 Years to 80 Years
Enrollment
60 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008 – 2013
U.S. locations
2
States / cities
Eugene, Oregon
Source: ClinicalTrials.gov public record
Updated Dec 3, 2014 · Synced Sep 1, 2026, 8:12 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 1, 2026, 8:12 PM EDT
Completed No phase listed Observational

Genetic Regulation of Surfactant Deficiency

NCT00828243
View directory record Official record
Conditions
Respiratory Distress Syndrome, Newborn
Interventions
Nutrient
Drug
Lead sponsor
Washington University School of Medicine
Other
Eligibility
1 Day to 6 Months
Enrollment
525 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2013
U.S. locations
1
States / cities
St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated Jun 6, 2021 · Synced Sep 1, 2026, 8:12 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 1, 2026, 8:12 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 1, 2026, 8:12 PM EDT
Completed Not applicable Interventional

Leucine-enriched Essential Amino Acid Intake to Optimize Protein Anabolism in Children With Cystic Fibrosis

NCT01172301
View directory record Official record
Conditions
Cystic Fibrosis
Interventions
Essential amino acid intake + Leucine vs total AA supplement
Dietary Supplement
Lead sponsor
Texas A&M University
Other
Eligibility
10 Years to 21 Years
Enrollment
14 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2013
U.S. locations
1
States / cities
Little Rock, Arkansas
Source: ClinicalTrials.gov public record
Updated Aug 10, 2015 · Synced Sep 1, 2026, 8:12 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Skeletal Muscle Protein Synthetic Response to Amino Acid and Peptides

NCT03952884
View directory record Official record
Conditions
Protein Metabolism
Interventions
Resistance Exercise, No Resistance Exercise, Leucine, Dileucine
Behavioral · Dietary Supplement
Lead sponsor
University of Illinois at Urbana-Champaign
Other
Eligibility
18 Years to 35 Years
Enrollment
10 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019
U.S. locations
1
States / cities
Urbana, Illinois
Source: ClinicalTrials.gov public record
Updated Sep 27, 2020 · Synced Sep 1, 2026, 8:12 PM EDT