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Showing 25–48 of 24 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: L-cysteine Clear all
Enrolling by invitation Not applicable Interventional

Physiological Effects of N-Acetyl Cysteine in Patients With Multiple Sclerosis

NCT03032601
View directory record Official record
Conditions
Multiple Sclerosis
Interventions
N-acetyl Cysteine
Dietary Supplement
Lead sponsor
Thomas Jefferson University
Other
Eligibility
18 Years and older
Enrollment
55 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2027
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Sep 16, 2025 · Synced Sep 27, 2026, 12:53 AM EDT
Completed Phase 2 Interventional Results available

N-Acetyl-Cysteine (NAC) in Early Phase Schizophrenia Spectrum Psychosis

NCT01354132
View directory record Official record
Conditions
Schizophrenic Psychoses
Interventions
n-acetylcysteine, Placebo
Drug
Lead sponsor
Beth Israel Deaconess Medical Center
Other
Eligibility
18 Years to 35 Years
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2014
U.S. locations
2
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jul 4, 2017 · Synced Sep 27, 2026, 12:53 AM EDT
Completed Phase 4 Interventional Results available

A Clinical Trial Via Telepsychiatry of Treatments for the Management of Emotional Dysregulation in Youth

NCT03911414
View directory record Official record
Conditions
Mood Disturbance, Mood Disorders, Natural Supplements, Alternative Treatment
Interventions
Open-label Treatment with Omega-3 Fatty Acids + Inositol, Open-label Treatment with N-acetylcysteine
Drug
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
5 Years to 17 Years
Enrollment
27 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2024
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Mar 17, 2026 · Synced Sep 27, 2026, 12:53 AM EDT
Terminated Phase 1 Interventional Results available

Trial of Famotidine & N-Acetyl Cysteine for Outpatients With COVID-19

NCT04545008
View directory record Official record
Conditions
Covid19
Interventions
Famotidine, N-Acetyl cysteine
Drug
Lead sponsor
Prisma Health-Upstate
Other
Eligibility
18 Years and older
Enrollment
2 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2021
U.S. locations
3
States / cities
Easley, South Carolina • Greenville, South Carolina • Greer, South Carolina
Source: ClinicalTrials.gov public record
Updated Feb 17, 2022 · Synced Sep 27, 2026, 12:53 AM EDT
Completed Phase 1Phase 2 Interventional Results available

The Effects of Kynurenine Aminotransferase Inhibition in People With Schizophrenia

NCT04013555
View directory record Official record
Conditions
Schizophrenia, Schizoaffective Disorder, Schizophreniform Disorder
Interventions
N-acetylcysteine (NAC), Placebo, Tryptophan
Drug
Lead sponsor
University of Maryland, Baltimore
Other
Eligibility
18 Years to 55 Years
Enrollment
88 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2024
U.S. locations
1
States / cities
Catonsville, Maryland
Source: ClinicalTrials.gov public record
Updated Feb 10, 2026 · Synced Sep 27, 2026, 12:53 AM EDT
Completed Phase 2 Interventional Accepts healthy volunteers

Efficacy of N-Acetylcysteine (NAC) in Preventing COVID-19 From Progressing to Severe Disease

NCT04419025
View directory record Official record
Conditions
COVID, Sars-CoV2, SARS-Associated Coronavirus as Cause of Disease Classified Elsewhere, Oxidative Stress
Interventions
N-acetylcysteine
Drug
Lead sponsor
Cambridge Health Alliance
Other
Eligibility
18 Years and older
Enrollment
165 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2021
U.S. locations
4
States / cities
Cambridge, Massachusetts • Everett, Massachusetts • Somerville, Massachusetts
Source: ClinicalTrials.gov public record
Updated May 27, 2021 · Synced Sep 27, 2026, 12:53 AM EDT
Completed Phase 1Phase 2 Interventional Results available

Evaluation of 18F-DCFBC PSMA-based PET Imaging for Detection of Metastatic Prostate Cancer

NCT01815515
View directory record Official record
Conditions
Metastatic Prostate Cancer
Interventions
18F-DCFBC
Drug
Lead sponsor
Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins
Other
Eligibility
18 Years to 100 Years · Male only
Enrollment
22 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2015
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Aug 19, 2018 · Synced Sep 27, 2026, 12:53 AM EDT
Withdrawn Not applicable Interventional

Dietary Cysteine and Methionine Deprivation (CMD) in Glioma Patients

NCT07553520
View directory record Official record
Conditions
Glioblastoma Multiforme, Recurrent Glioma
Interventions
Normal diet, Cysteine/methionine deprivation (CMD) diet for 2 days, Cysteine/methionine deprivation (CMD) diet for 4 days
Other
Lead sponsor
UNC Lineberger Comprehensive Cancer Center
Other
Eligibility
18 Years and older
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2028
U.S. locations
1
States / cities
Chapel Hill, North Carolina
Source: ClinicalTrials.gov public record
Updated Apr 27, 2026 · Synced Sep 27, 2026, 12:53 AM EDT
Terminated Phase 4 Interventional Results available

Inpatient Clinical Trial of NAC

NCT03581084
View directory record Official record
Conditions
Asthma
Interventions
N-acetylcysteine
Drug
Lead sponsor
University of California, San Francisco
Other
Eligibility
18 Years to 80 Years
Enrollment
1 participant
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018
U.S. locations
1
States / cities
San Francisco, California
Source: ClinicalTrials.gov public record
Updated Oct 25, 2021 · Synced Sep 27, 2026, 12:53 AM EDT
Withdrawn Phase 1Phase 2 Interventional

Inhaled NAC in Treatment of IPF

NCT03720483
View directory record Official record
Conditions
Idiopathic Pulmonary Fibrosis (IPF)
Interventions
N-acetyl cysteine then Placebo, Placebo then N-acetyl cysteine
Drug
Lead sponsor
University of Colorado, Denver
Other
Eligibility
40 Years to 75 Years
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2023
U.S. locations
1
States / cities
Aurora, Colorado
Source: ClinicalTrials.gov public record
Updated Jun 7, 2021 · Synced Sep 27, 2026, 12:53 AM EDT
Terminated Phase 1 Interventional

Acetylcysteine, Mannitol, Combination Chemotherapy, and Sodium Thiosulfate in Treating Children With Malignant Brain Tumors

NCT00238173
View directory record Official record
Conditions
Bone Marrow Suppression, Brain and Central Nervous System Tumors, Drug/Agent Toxicity by Tissue/Organ, Long-term Effects Secondary to Cancer Therapy in Children
Interventions
filgrastim, acetylcysteine, carboplatin, cyclophosphamide, etoposide phosphate, mannitol, sodium thiosulfate
Biological · Drug
Lead sponsor
OHSU Knight Cancer Institute
Other
Eligibility
1 Year to 18 Years
Enrollment
2 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2004 – 2006
U.S. locations
1
States / cities
Portland, Oregon
Source: ClinicalTrials.gov public record
Updated Apr 20, 2017 · Synced Sep 27, 2026, 12:53 AM EDT
Not listed Not applicable Interventional

Supplemental Adjuvants for Intracellular Nutrition and Treatment

NCT00893724
View directory record Official record
Conditions
Neovascular Age-related Macular Degeneration, Diabetic Macular Edema
Interventions
Neutral pills with no medicinal effect, Inosine; Tocopherols, Tocotrienol, CoQ10 combination capsule; Niacinamide SR; Viatmin C; N-acetyl Cysteine; Complete Multivitamin with all minerals, Inosine; Tocopherol, Tocotrienol, CoQ10 combination capsule; Niacinamide; Vitamin C; N-acetyl Cysteine; Complete Multivitamin with all minerals; Minocycline
Drug · Dietary Supplement
Lead sponsor
Mid-Atlantic Retina Consultations, Inc.
Other
Eligibility
Not listed
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2011
U.S. locations
1
States / cities
Morgantown, West Virginia
Source: ClinicalTrials.gov public record
Updated Jul 19, 2011 · Synced Sep 27, 2026, 12:53 AM EDT
Completed Phase 1Phase 2 Interventional Results available

A Randomized Double Blinded Study to Examine the Use of N-acetyl Cysteine for the Prevention and Treatment of HAAF in Patients With Type 1 Diabetes

NCT02206152
View directory record Official record
Conditions
Type 1 Diabetes, Hypoglycemia Unawareness
Interventions
N-acetyl cysteine, Placebo
Drug
Lead sponsor
University of Minnesota
Other
Eligibility
18 Years to 65 Years
Enrollment
22 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2017
U.S. locations
1
States / cities
Minneapolis, Minnesota
Source: ClinicalTrials.gov public record
Updated Jan 30, 2020 · Synced Sep 27, 2026, 12:53 AM EDT
Withdrawn Not applicable Interventional

Acetaminophen in Combination With N-Acetylcysteine (NAC) Versus Placebo in Treating Fever

NCT01137591
View directory record Official record
Conditions
Liver Failure, Liver Failure, Acute, Drug Induced Liver Injury, Prevention & Control, Fever
Interventions
APAP and NAC combination, APAP and Placebo
Drug
Lead sponsor
Columbia University
Other
Eligibility
18 Years to 75 Years
Healthy volunteers
Healthy volunteers not accepted
Timeline
Started 2009
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Mar 4, 2015 · Synced Sep 27, 2026, 12:53 AM EDT
Terminated Early Phase 1 Interventional Accepts healthy volunteers

N-acetylcysteine Effects on Tetrahydrocannabinol

NCT02335060
View directory record Official record
Conditions
Healthy
Interventions
Delta-9-THC, N-acetylcysteine, Placebo
Drug
Lead sponsor
Yale University
Other
Eligibility
18 Years to 55 Years
Enrollment
5 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014
U.S. locations
1
States / cities
West Haven, Connecticut
Source: ClinicalTrials.gov public record
Updated Jan 30, 2022 · Synced Sep 27, 2026, 12:53 AM EDT
Completed Phase 2 Interventional Results available

N-Acetyl Cysteine in Trichotillomania

NCT00354770
View directory record Official record
Conditions
Trichotillomania
Interventions
Placebo, N-Acetyl Cysteine
Drug
Lead sponsor
University of Chicago
Other
Eligibility
18 Years to 65 Years
Enrollment
50 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2008
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Feb 22, 2023 · Synced Sep 27, 2026, 12:53 AM EDT
Completed Not applicable Interventional

N-acetylcysteine in Liver Transplantation

NCT00736541
View directory record Official record
Conditions
End Stage Liver Failure
Interventions
N-acetylcysteine
Drug
Lead sponsor
Ibtesam Hilmi
Other
Eligibility
18 Years and older
Enrollment
100 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2004 – 2008
U.S. locations
1
States / cities
Pittsburgh, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Apr 27, 2023 · Synced Sep 27, 2026, 12:53 AM EDT
Completed Phase 1 Interventional

Biodistribution and Pharmacokinetic Study of 18F-DCFBC Prostate Specific Membrane Antigen Based PET in Patients With Advanced Prostate Cancer

NCT01417182
View directory record Official record
Conditions
Prostate Cancer
Interventions
18F-DCFBC
Drug
Lead sponsor
Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins
Other
Eligibility
18 Years to 90 Years · Male only
Enrollment
5 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2014
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Jan 16, 2019 · Synced Sep 27, 2026, 12:53 AM EDT
Completed Phase 4 Interventional Results available

Open-Label Study of N-Acetylcysteine in Children and Adolescents 5-17 With Bipolar Spectrum Disorders

NCT02357290
View directory record Official record
Conditions
Bipolar Disorder
Interventions
Open-label Treatment with N-Acetylcysteine
Drug
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
5 Years to 17 Years
Enrollment
40 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2018
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Nov 3, 2019 · Synced Sep 27, 2026, 12:53 AM EDT
Completed Phase 2 Interventional Accepts healthy volunteers Results available

Oral N-acetylcysteine for Protection of Human Nevi Against UV-induced Oxidative Stress/Damage in Vivo

NCT01612221
View directory record Official record
Conditions
Patients at Risk for Melanoma
Interventions
N-acetylcysteine, Placebo arm
Drug · Other
Lead sponsor
University of Utah
Other
Eligibility
18 Years and older
Enrollment
100 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2016
U.S. locations
1
States / cities
Salt Lake City, Utah
Source: ClinicalTrials.gov public record
Updated Jul 30, 2017 · Synced Sep 27, 2026, 12:53 AM EDT
Completed Phase 2 Interventional Results available

Evaluating the Hypothesized Mechanism of Action of N-acetylcysteine for Bipolar Disorder

NCT05340504
View directory record Official record
Conditions
Bipolar Disorder, Bipolar I Disorder, Bipolar II Disorder
Interventions
N-Acetyl cysteine, Placebo
Drug
Lead sponsor
Medical University of South Carolina
Other
Eligibility
18 Years to 60 Years
Enrollment
12 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2023
U.S. locations
1
States / cities
Charleston, South Carolina
Source: ClinicalTrials.gov public record
Updated Jun 25, 2024 · Synced Sep 27, 2026, 12:53 AM EDT
Recruiting Early Phase 1 Interventional

Imaging Acetadote Metabolism in Glioblastoma

NCT07387666
View directory record Official record
Conditions
Glioblastoma, GBM
Interventions
Acetadote
Drug
Lead sponsor
University of Texas Southwestern Medical Center
Other
Eligibility
18 Years and older
Enrollment
10 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2028
U.S. locations
1
States / cities
Dallas, Texas
Source: ClinicalTrials.gov public record
Updated Jun 22, 2026 · Synced Sep 27, 2026, 12:53 AM EDT
Completed Phase 2 Interventional

Combination Chemotherapy in Treating Patients With Stage III or Stage IV Melanoma

NCT00003346
View directory record Official record
Conditions
Melanoma (Skin)
Interventions
acetaminophen, acetylcysteine, carmustine
Drug
Lead sponsor
Memorial Sloan Kettering Cancer Center
Other
Eligibility
18 Years and older
Enrollment
80 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
1997 – 2003
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Jun 24, 2013 · Synced Sep 27, 2026, 12:53 AM EDT
Terminated Phase 4 Interventional Accepts healthy volunteers Results available

Induced Changes in Ventilatory Responsiveness and Altitude Exposure

NCT01241513
View directory record Official record
Conditions
Effects of High Altitude, Hypoxia, Inadequate or Impaired Breathing Pattern or Ventilation, Abnormal Blood Oxygen Pressure
Interventions
NAC, Placebo
Drug
Lead sponsor
United States Army Research Institute of Environmental Medicine
Federal
Eligibility
18 Years to 39 Years
Enrollment
21 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2013
U.S. locations
1
States / cities
Natick, Massachusetts
Source: ClinicalTrials.gov public record
Updated Apr 29, 2020 · Synced Sep 27, 2026, 12:53 AM EDT