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ClinicalTrials.gov public records Last synced Oct 21, 2026, 5:44 AM EDT

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Showing 1–24 of 63 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: L-Tryptophan Clear all
Completed Phase 1 Interventional

1-Methyl-D-Tryptophan in Treating Patients With Metastatic or Refractory Solid Tumors That Cannot Be Removed By Surgery

NCT00567931
View directory record Official record
Conditions
Unspecified Adult Solid Tumor, Protocol Specific
Interventions
1-methyl-d-tryptophan, pharmacological study, laboratory biomarker analysis
Drug · Other
Lead sponsor
National Cancer Institute (NCI)
NIH
Eligibility
18 Years and older
Enrollment
52 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2012
U.S. locations
2
States / cities
Tampa, Florida • Richmond, Virginia
Source: ClinicalTrials.gov public record
Updated Jul 24, 2014 · Synced Oct 21, 2026, 5:44 AM EDT
Completed Phase 2 Interventional Results available

ERG/5-HTP in Fragile X Syndrome (FXS)

NCT05030129
View directory record Official record
Conditions
Fragile X Syndrome
Interventions
5-Hydroxytryptophan, Ergoloid Mesylates, Matching placebo for Ergoloid mesylates, Matching placebo for 5-Hydroxytryptophan
Drug
Lead sponsor
Elizabeth Berry-Kravis
Other
Eligibility
18 Years to 45 Years · Male only
Enrollment
15 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2023
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Sep 19, 2024 · Synced Oct 21, 2026, 5:44 AM EDT
Active, not recruiting Phase 2 Interventional

Pilot Study of Mirtazapine for the Dual Tx of Depression and CINV in High-Grade Glioma Pts on TMZ

NCT03935685
View directory record Official record
Conditions
Glioma of Brain
Interventions
Mirtazapine (Remeron)
Drug
Lead sponsor
University of California, Irvine
Other
Eligibility
18 Years and older
Enrollment
120 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2030
U.S. locations
1
States / cities
Orange, California
Source: ClinicalTrials.gov public record
Updated Sep 24, 2025 · Synced Oct 21, 2026, 5:44 AM EDT
Completed Phase 2 Interventional Results available

Enzalutamide Versus Standard Androgen Deprivation Therapy for the Treatment Hormone Sensitive Prostate Cancer

NCT02278185
View directory record Official record
Conditions
Adenocarcinoma of the Prostate, Recurrent Prostate Cancer, Stage III Prostate Cancer, Stage IV Prostate Cancer
Interventions
Enzalutamide, leuprolide acetate, goserelin acetate, histrelin acetate, triptorelin, degarelix
Drug
Lead sponsor
University of Colorado, Denver
Other
Eligibility
19 Years and older · Male only
Enrollment
19 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2024
U.S. locations
2
States / cities
Aurora, Colorado • Fort Collins, Colorado
Source: ClinicalTrials.gov public record
Updated May 11, 2025 · Synced Oct 21, 2026, 5:44 AM EDT
Completed No phase listed Observational

L-5-HTP-Related EMS

NCT00001918
View directory record Official record
Conditions
Eosinophilia-Myalgia Syndrome
Interventions
Not listed
Lead sponsor
National Institute of Mental Health (NIMH)
NIH
Eligibility
Not listed
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
1999 – 2000
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Mar 4, 2008 · Synced Oct 21, 2026, 5:44 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Onnit Labs New Mood Supplementation in Healthy College Students

NCT05109923
View directory record Official record
Conditions
Mental Health Wellness 1
Interventions
Multi-Ingredient Herbal Supplement, Placebo Supplement
Dietary Supplement
Lead sponsor
University of Idaho
Other
Eligibility
18 Years to 24 Years
Enrollment
56 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2019
U.S. locations
1
States / cities
Moscow, Idaho
Source: ClinicalTrials.gov public record
Updated Nov 5, 2021 · Synced Oct 21, 2026, 5:44 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

Serotonin in Alcoholism

NCT00011752
View directory record Official record
Conditions
Alcoholism, Healthy
Interventions
FCWAY
Drug
Lead sponsor
National Institute on Alcohol Abuse and Alcoholism (NIAAA)
NIH
Eligibility
Not listed
Enrollment
75 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2001 – 2005
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Mar 4, 2008 · Synced Oct 21, 2026, 5:44 AM EDT
Completed No phase listed Observational

Investigating the Role of Serotonin in Emotional Processing Through the Use of Tryptophan Depletion

NCT00090831
View directory record Official record
Conditions
Healthy
Interventions
Not listed
Lead sponsor
National Institute of Mental Health (NIMH)
NIH
Eligibility
20 Years to 50 Years
Enrollment
91 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2004 – 2012
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Dec 3, 2019 · Synced Oct 21, 2026, 5:44 AM EDT
Completed Phase 3 Interventional Results available

Suppression of Ovarian Function With Either Tamoxifen or Exemestane Compared With Tamoxifen Alone in Treating Premenopausal Women With Hormone-Responsive Breast Cancer

NCT00066690
View directory record Official record
Conditions
Estrogen Receptor Positive Breast Cancer, Progesterone Receptor Positive Tumor, Recurrent Breast Carcinoma, Stage IA Breast Cancer, Stage IB Breast Cancer, Stage IIA Breast Cancer, Stage IIB Breast Cancer, Stage IIIA Breast Cancer
Interventions
Exemestane, Laboratory Biomarker Analysis, Oophorectomy, Quality-of-Life Assessment, Radiation Therapy, Tamoxifen, Triptorelin
Drug · Other · Procedure + 1 more
Lead sponsor
ETOP IBCSG Partners Foundation
Network
Eligibility
18 Years to 65 Years · Female only
Enrollment
3,066 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2003 – 2024
U.S. locations
480
States / cities
Birmingham, Alabama • Anchorage, Alaska • Scottsdale, Arizona + 323 more
Source: ClinicalTrials.gov public record
Updated Aug 26, 2026 · Synced Oct 21, 2026, 5:44 AM EDT
Completed Early Phase 1 Interventional Accepts healthy volunteers

Dietary Intake of Tryptophan and Metformin Response

NCT02184832
View directory record Official record
Conditions
Metformin Response, Fasting Glucose, Tryptophan Concentration, Metformin Concentration, Diet Tolerability
Interventions
Metformin, Low tryptophan diet, High tryptophan diet
Drug · Other
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
20 Years to 40 Years
Enrollment
20 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014 – 2016
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Mar 16, 2016 · Synced Oct 21, 2026, 5:44 AM EDT
Active, not recruiting Phase 2Phase 3 Interventional

Effects of 5HTP on the Injured Human Spinal Cord

NCT04520178
View directory record Official record
Conditions
Spinal Cord Injuries
Interventions
5-Hydroxytryptophan 100 MG, 5-Hydroxytryptophan, Carbidopa, Placebo
Drug
Lead sponsor
University of Alberta
Other
Eligibility
18 Years to 65 Years
Enrollment
6 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2026
U.S. locations
1
States / cities
Louisville, Kentucky
Source: ClinicalTrials.gov public record
Updated Sep 16, 2026 · Synced Oct 21, 2026, 5:44 AM EDT
Recruiting Phase 2 Interventional

5HTP Regulation Of Asthma In Children

NCT04160910
View directory record Official record
Conditions
Mild or Moderate Asthma With Allergic Sensitization
Interventions
5-Hydroxytryptophan, Placebo
Drug
Lead sponsor
Indiana University
Other
Eligibility
8 Years to 18 Years
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2026
U.S. locations
1
States / cities
Indianapolis, Indiana
Source: ClinicalTrials.gov public record
Updated Oct 1, 2026 · Synced Oct 21, 2026, 5:44 AM EDT
Completed Phase 2 Interventional Results available

Phase II Study of Sipuleucel-T and Indoximod for Patients With Refractory Metastatic Prostate Cancer

NCT01560923
View directory record Official record
Conditions
Metastatic Prostate Cancer
Interventions
Indoximod, Sipuleucel-T, Placebo
Biological · Other
Lead sponsor
Masonic Cancer Center, University of Minnesota
Other
Eligibility
18 Years and older · Male only
Enrollment
47 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2018
U.S. locations
4
States / cities
Chicago, Illinois • Minneapolis, Minnesota • New York, New York + 1 more
Source: ClinicalTrials.gov public record
Updated Apr 3, 2020 · Synced Oct 21, 2026, 5:44 AM EDT
Active, not recruiting Phase 3 Interventional

Two Studies for Patients With Unfavorable Intermediate Risk Prostate Cancer Testing Less Intense Treatment for Patients With a Low Gene Risk Score and Testing a More Intense Treatment for Patients With a Higher Gene Risk Score, The Guidance Trial

NCT05050084
View directory record Official record
Conditions
Prostate Adenocarcinoma
Interventions
Bicalutamide, Buserelin, Darolutamide, Degarelix, Flutamide, Goserelin, Histrelin, Leuprolide, Radiation Therapy, Relugolix, Triptorelin
Drug · Radiation
Lead sponsor
NRG Oncology
Other
Eligibility
18 Years and older · Male only
Enrollment
2,050 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2031
U.S. locations
567
States / cities
Birmingham, Alabama • Gilbert, Arizona • Peoria, Arizona + 432 more
Source: ClinicalTrials.gov public record
Updated Aug 17, 2026 · Synced Oct 21, 2026, 5:44 AM 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 14, 2015 · Synced Oct 21, 2026, 5:44 AM EDT
Completed No phase listed Observational Results available

Genetic and Biochemical Markers of Interferon-Induced Depression.

NCT00252538
View directory record Official record
Conditions
Depression
Interventions
Not listed
Lead sponsor
US Department of Veterans Affairs
Federal
Eligibility
18 Years and older
Enrollment
133 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2009
U.S. locations
3
States / cities
Long Beach, California • Minneapolis, Minnesota • Portland, Oregon
Source: ClinicalTrials.gov public record
Updated Dec 11, 2014 · Synced Oct 21, 2026, 5:44 AM EDT
Completed Phase 4 Interventional

Treatment of Obsessive-Compulsive Disorder

NCT00000373
View directory record Official record
Conditions
Obsessive-Compulsive Disorder
Interventions
olanzapine + fluoxetine, placebo + fluoxetine
Drug
Lead sponsor
University of Florida
Other
Eligibility
14 Years to 70 Years
Enrollment
74 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
1992 – 2003
U.S. locations
2
States / cities
Gainesville, Florida • Jacksonville, Florida
Source: ClinicalTrials.gov public record
Updated Nov 27, 2013 · Synced Oct 21, 2026, 5:44 AM EDT
Completed Phase 2 Interventional Results available

Pembrolizumab TX-naive Distant Mets Melanoma and Use of (C11-AMT) PET at Baseline as Imaging Biomarker

NCT03089606
View directory record Official record
Conditions
Melanoma
Interventions
FDG PET/CT scan, C11-AMT PET scan, Pembrolizumab, CT scan
Diagnostic Test · Drug
Lead sponsor
UNC Lineberger Comprehensive Cancer Center
Other
Eligibility
18 Years and older
Enrollment
27 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2023
U.S. locations
2
States / cities
Chapel Hill, North Carolina • Raleigh, North Carolina
Source: ClinicalTrials.gov public record
Updated Nov 15, 2023 · Synced Oct 21, 2026, 5:44 AM EDT
Completed Phase 1Phase 2 Interventional Results available

Study of IDO Inhibitor and Temozolomide for Adult Patients With Primary Malignant Brain Tumors

NCT02052648
View directory record Official record
Conditions
Glioblastoma Multiforme, Glioma, Gliosarcoma, Malignant Brain Tumor
Interventions
Indoximod, Temozolomide, Bevacizumab, Stereotactic Radiation
Drug · Radiation
Lead sponsor
NewLink Genetics Corporation
Industry
Eligibility
16 Years and older
Enrollment
160 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2019
U.S. locations
17
States / cities
Castro Valley, California • Los Angeles, California • Orange, California + 14 more
Source: ClinicalTrials.gov public record
Updated Mar 27, 2024 · Synced Oct 21, 2026, 5:44 AM EDT
Recruiting Phase 3 Interventional

Standard Systemic Therapy With or Without Definitive Treatment in Treating Participants With Metastatic Prostate Cancer

NCT03678025
View directory record Official record
Conditions
Castration Levels of Testosterone, Metastatic Prostatic Adenocarcinoma, Stage IV Prostate Cancer AJCC v8, Stage IVA Prostate Cancer AJCC v8, Stage IVB Prostate Cancer AJCC v8
Interventions
Abiraterone, Bicalutamide, Degarelix, Docetaxel, Flutamide, Goserelin Acetate, Histrelin Acetate, Leuprolide Acetate, Nilutamide, Orchiectomy, Prednisone, Quality-of-Life Assessment, Radiation Therapy, Radical Prostatectomy, Triptorelin
Drug · Procedure · Other + 1 more
Lead sponsor
SWOG Cancer Research Network
Network
Eligibility
18 Years and older · Male only
Enrollment
1,273 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2036
U.S. locations
334
States / cities
Gilbert, Arizona • Phoenix, Arizona • Scottsdale, Arizona + 253 more
Source: ClinicalTrials.gov public record
Updated Oct 8, 2026 · Synced Oct 21, 2026, 5:44 AM EDT
Withdrawn Not applicable Interventional

Pilot Study: Combining Nutritional Supplements With Standard Antidepressant to Treat Depression.

NCT02223299
View directory record Official record
Conditions
Depression
Interventions
L-tyrosine, L-Tryptophan, deplin, Placebo A, Placebo B
Dietary Supplement · Drug · Other
Lead sponsor
John D. Dingell VA Medical Center
Federal
Eligibility
18 Years to 65 Years
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015
U.S. locations
1
States / cities
Detroit, Michigan
Source: ClinicalTrials.gov public record
Updated Feb 21, 2020 · Synced Oct 21, 2026, 5:44 AM EDT
Completed Phase 2 Interventional Results available

AMT-PET in Monitoring Telotristat Etiprate Treatment in Participants With MetastaticNeuroendocrine Neoplasm

NCT03453489
View directory record Official record
Conditions
Carcinoid Syndrome, Metastatic Nonfunctional Well Differentiated Neuroendocrine Neoplasm
Interventions
Carbon C 11 Alpha-methyltryptophan, Laboratory Biomarker Analysis, Positron Emission Tomography, Telotristat Etiprate
Other · Procedure · Drug
Lead sponsor
Barbara Ann Karmanos Cancer Institute
Other
Eligibility
18 Years and older
Enrollment
4 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2020
U.S. locations
1
States / cities
Detroit, Michigan
Source: ClinicalTrials.gov public record
Updated Apr 10, 2025 · Synced Oct 21, 2026, 5:44 AM EDT
Completed Phase 1Phase 2 Interventional Results available

Vaccine Therapy and 1-MT in Treating Patients With Metastatic Breast Cancer

NCT01042535
View directory record Official record
Conditions
Male Breast Cancer, Recurrent Breast Cancer, Stage IV Breast Cancer, Unspecified Adult Solid Tumor, Protocol Specific
Interventions
adenovirus-p53 transduced dendritic cell (DC) vaccine, 1-methyl-d-tryptophan, Laboratory biomarker analysis
Biological · Drug · Other
Lead sponsor
H. Lee Moffitt Cancer Center and Research Institute
Other
Eligibility
18 Years and older
Enrollment
44 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2018
U.S. locations
1
States / cities
Tampa, Florida
Source: ClinicalTrials.gov public record
Updated Apr 11, 2018 · Synced Oct 21, 2026, 5:44 AM EDT
Completed Phase 1 Interventional

Study of the IDO Pathway Inhibitor, Indoximod, and Temozolomide for Pediatric Patients With Progressive Primary Malignant Brain Tumors

NCT02502708
View directory record Official record
Conditions
Glioblastoma Multiforme, Glioma, Gliosarcoma, Malignant Brain Tumor, Ependymoma, Medulloblastoma, Diffuse Intrinsic Pontine Glioma, Primary CNS Tumor
Interventions
Indoximod, Temozolomide, Conformal Radiation, Cyclophosphamide, Etoposide
Drug · Radiation
Lead sponsor
NewLink Genetics Corporation
Industry
Eligibility
3 Years to 21 Years
Enrollment
81 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2020
U.S. locations
5
States / cities
Aurora, Colorado • Orlando, Florida • Atlanta, Georgia + 2 more
Source: ClinicalTrials.gov public record
Updated Jun 4, 2020 · Synced Oct 21, 2026, 5:44 AM EDT