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ClinicalTrials.gov public records Last synced Sep 5, 2026, 3:36 PM EDT

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Showing 1–24 of 63 matching trials from the live ClinicalTrials.gov search.
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Filters: Condition: Smell Loss Clear all
Active, not recruiting No phase listed Observational Accepts healthy volunteers

Longitudinal At Home Smell Testing to Detect Infection by SARS-CoV-2

NCT05040659
View directory record Official record
Conditions
Anosmia, Asymptomatic COVID-19, COVID-19 Respiratory Infection, Influenza, Healthy, PASC Post Acute Sequelae of COVID 19
Interventions
AROMHA Longitudinal Smell Test
Device
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
18 Years to 100 Years
Enrollment
1,000 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2027
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Mar 5, 2026 · Synced Sep 5, 2026, 3:36 PM EDT
Recruiting Phase 2Phase 3 Interventional

Study of Chemosensory Enhancement Through Neuromodulation Training (SCENT for Long COVID)

NCT05855369
View directory record Official record
Conditions
Smell Dysfunction, Olfactory Disorder, Long COVID
Interventions
Trigeminal Nerve Stimulation (TNS), Active Smell Training (ST), Placebo Smell Training (PBO)
Device · Other
Lead sponsor
Medical University of South Carolina
Other
Eligibility
18 Years to 65 Years
Enrollment
145 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2028
U.S. locations
1
States / cities
Charleston, South Carolina
Source: ClinicalTrials.gov public record
Updated Apr 1, 2026 · Synced Sep 5, 2026, 3:36 PM EDT
Terminated Phase 3 Interventional Results available

NAC for Head Trauma-induced Anosmia

NCT03680911
View directory record Official record
Conditions
Anosmia, Head Trauma
Interventions
N Acetyl Cysteine, Placebo oral capsule
Drug
Lead sponsor
University of Miami
Other
Eligibility
18 Years and older
Enrollment
7 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2020
U.S. locations
1
States / cities
Miami, Florida
Source: ClinicalTrials.gov public record
Updated Feb 3, 2021 · Synced Sep 5, 2026, 3:36 PM EDT
Completed Phase 3 Interventional

Megestrol to Limit Weight Loss and Improve Quality of Life in Treating Patients With Head and Neck Cancer

NCT00006799
View directory record Official record
Conditions
Anorexia, Cachexia, Head and Neck Cancer, Quality of Life
Interventions
megestrol acetate, quality-of-life assessment
Drug · Procedure
Lead sponsor
Wake Forest University Health Sciences
Other
Eligibility
18 Years to 120 Years
Enrollment
13 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2000 – 2002
U.S. locations
1
States / cities
Winston-Salem, North Carolina
Source: ClinicalTrials.gov public record
Updated Sep 8, 2021 · Synced Sep 5, 2026, 3:36 PM EDT
Active, not recruiting Early Phase 1 Interventional Accepts healthy volunteers

In Vivo Imaging of the Olfactory Epithelium Using Confocal Laser Endomicroscopy

NCT07546617
View directory record Official record
Conditions
Endonasal Surgery, Endoscopic Sinus Surgery, Olfactory Dysfunction
Interventions
CONVIVO system, Fluorescein injection, USP 10%
Device · Drug
Lead sponsor
Dartmouth-Hitchcock Medical Center
Other
Eligibility
18 Years and older
Enrollment
36 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2026 – 2027
U.S. locations
1
States / cities
Lebanon, New Hampshire
Source: ClinicalTrials.gov public record
Updated Sep 1, 2026 · Synced Sep 5, 2026, 3:36 PM EDT
Completed No phase listed Observational Results available

Validation of a Rapid Quantitative Test for Loss of Smell in COVID-19 Subjects

NCT04431908
View directory record Official record
Conditions
COVID-19
Interventions
olfactory device
Device
Lead sponsor
Yale University
Other
Eligibility
18 Years and older
Enrollment
1,320 participants
Timeline
2020
U.S. locations
1
States / cities
New Haven, Connecticut
Source: ClinicalTrials.gov public record
Updated Jun 1, 2021 · Synced Sep 5, 2026, 3:36 PM EDT
Completed No phase listed Observational

Decrease in Sense of Smell and Associated Cognitive Decline in Parkinson's Disease

NCT01572142
View directory record Official record
Conditions
Parkinson's Disease
Interventions
Not listed
Lead sponsor
University of Michigan
Other
Eligibility
50 Years and older
Enrollment
74 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2016
U.S. locations
1
States / cities
Ann Arbor, Michigan
Source: ClinicalTrials.gov public record
Updated Sep 28, 2017 · Synced Sep 5, 2026, 3:36 PM EDT
Completed Not applicable Interventional

At-Home Olfactory Training

NCT03611673
View directory record Official record
Conditions
Olfactory Disorder
Interventions
Smell Test
Other
Lead sponsor
University of Kansas Medical Center
Other
Eligibility
18 Years to 80 Years
Enrollment
70 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2021
U.S. locations
1
States / cities
Kansas City, Kansas
Source: ClinicalTrials.gov public record
Updated Jul 19, 2023 · Synced Sep 5, 2026, 3:36 PM EDT
Recruiting Not applicable Interventional

Scents of Progress: Leveraging a Novel Device for Olfactory Training in Older Adults

NCT06733636
View directory record Official record
Conditions
Olfactory Dysfunction, Smell Loss, Anosmia, Hyposmia
Interventions
Sudoku Puzzles, ScentCare (Olfactory Training Device)
Other
Lead sponsor
Johns Hopkins University
Other
Eligibility
60 Years and older
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2027
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Apr 12, 2026 · Synced Sep 5, 2026, 3:36 PM EDT
Completed Phase 2 Interventional Results available

Helping Olfaction and Nutrition On Renal Replacement

NCT02479451
View directory record Official record
Conditions
End Stage Renal Disease, Olfactory Disorders
Interventions
Theophylline
Drug
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
18 Years and older
Enrollment
7 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2022
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jan 8, 2024 · Synced Sep 5, 2026, 3:36 PM EDT
Completed Phase 4 Interventional Results available

Olfactory Deficits and Donepezil Treatment in Cognitively Impaired Elderly

NCT01951118
View directory record Official record
Conditions
Alzheimer Disease, Mild Cognitive Impairment, Delirium, Dementia, Amnestic, Cognitive Disorders
Interventions
Donepezil
Drug
Lead sponsor
New York State Psychiatric Institute
Other
Eligibility
55 Years to 95 Years
Enrollment
121 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2019
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Jul 12, 2020 · Synced Sep 5, 2026, 3:36 PM EDT
Completed Not applicable Interventional

What the Nose Knows: Hedonic Capacity, Psychosocial Interventions and Outcomes in Schizophrenia

NCT05282186
View directory record Official record
Conditions
Schizophrenia
Interventions
Cognitive Enhancement Therapy, Social Skills Training
Behavioral
Lead sponsor
Beth Israel Deaconess Medical Center
Other
Eligibility
18 Years to 65 Years
Enrollment
134 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2025
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jul 9, 2025 · Synced Sep 5, 2026, 3:36 PM EDT
Completed Not applicable Interventional

Visual-OLfactory Training in Participants With COVID-19 Resultant Loss of Smell

NCT04710394
View directory record Official record
Conditions
Anosmia, Covid19, Ageusia, Hyposmia, Hypogeusia, SARS-CoV-2 Infection, COVID-19 Pandemic
Interventions
Smell Training
Behavioral
Lead sponsor
Washington University School of Medicine
Other
Eligibility
18 Years to 70 Years
Enrollment
240 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2022
U.S. locations
1
States / cities
St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated Jun 20, 2022 · Synced Sep 5, 2026, 3:36 PM EDT
Completed Phase 2 Interventional Results available

Stellate Ganglion Block for COVID-induced Parosmia

NCT06253806
View directory record Official record
Conditions
COVID-19-Induced Parosmia
Interventions
Stellate Ganglion Block, Placebo Sham Injection
Drug
Lead sponsor
Washington University School of Medicine
Other
Eligibility
18 Years to 70 Years
Enrollment
48 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2024
U.S. locations
1
States / cities
St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated Nov 9, 2025 · Synced Sep 5, 2026, 3:36 PM EDT
Completed Phase 2 Interventional Results available

Smell Changes & Efficacy of Nasal Theophylline

NCT03990766
View directory record Official record
Conditions
Olfactory Disorder, Anosmia, Viral Infection, Theophylline Causing Adverse Effects in Therapeutic Use, Smell Disorder
Interventions
Theophylline, Saline Nasal
Drug
Lead sponsor
Washington University School of Medicine
Other
Eligibility
18 Years to 70 Years
Enrollment
27 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2021
U.S. locations
1
States / cities
St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated Mar 30, 2022 · Synced Sep 5, 2026, 3:36 PM EDT
Withdrawn Phase 2 Interventional

Trial of Directed High-dose Nasal Steroids on Residual Smell Loss in Sinus Patients After Sinus Surgery

NCT01814618
View directory record Official record
Conditions
Olfaction Disorders, Sinusitis, Paranasal Sinus Diseases
Interventions
Budesonide Respules
Drug
Lead sponsor
University of North Carolina, Chapel Hill
Other
Eligibility
18 Years to 84 Years
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013
U.S. locations
1
States / cities
Chapel Hill, North Carolina
Source: ClinicalTrials.gov public record
Updated Apr 5, 2016 · Synced Sep 5, 2026, 3:36 PM EDT
Recruiting No phase listed Observational

NIDCD Otolaryngology Clinical Protocol Biospecimen Bank

NCT06303180
View directory record Official record
Conditions
Hearing Loss, Head and Neck Neoplasms, Hearing Disorders, Laryngeal Disease
Interventions
Not listed
Lead sponsor
National Institute on Deafness and Other Communication Disorders (NIDCD)
NIH
Eligibility
3 Years to 99 Years
Enrollment
1,000 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2033
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Nov 13, 2025 · Synced Sep 5, 2026, 3:36 PM EDT
Withdrawn Phase 2 Interventional

Coronavirus Smell Therapy for Anosmia Recovery

NCT04422275
View directory record Official record
Conditions
Anosmia
Interventions
Budesonide, High-Concentration Essential Oil, Placebo, Low-Concentration Essential Oil
Drug · Behavioral
Lead sponsor
Washington University School of Medicine
Other
Eligibility
18 Years to 85 Years
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2023
U.S. locations
1
States / cities
St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated Mar 1, 2021 · Synced Sep 5, 2026, 3:36 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Taste Perception and Chronic Disease Risk

NCT01023906
View directory record Official record
Conditions
Cardiovascular Disease, Diabetes, Obesity, Metabolic Syndrome, Aging
Interventions
Not listed
Lead sponsor
Tufts University
Other
Eligibility
18 Years to 85 Years
Enrollment
90 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008 – 2010
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated May 22, 2014 · Synced Sep 5, 2026, 3:36 PM EDT
Completed Phase 2 Interventional Results available

COVID-19 Anosmia Study

NCT04495816
View directory record Official record
Conditions
Anosmia, Covid19
Interventions
Omega-3 Fatty Acid Supplement, Placebo/Control
Drug
Lead sponsor
Icahn School of Medicine at Mount Sinai
Other
Eligibility
18 Years and older
Enrollment
139 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2021
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Oct 22, 2023 · Synced Sep 5, 2026, 3:36 PM EDT
Completed Not applicable Interventional

Multimodal Investigation of Post COVID-19 in Females

NCT05225220
View directory record Official record
Conditions
Post COVID-19, Cognitive Dysfunction
Interventions
Parasym Device (of Parasym Ltd, UK) using Transcutaneous Vagus Nerve Stimulation (t-VNS)
Device
Lead sponsor
Casa Colina Hospital and Centers for Healthcare
Other
Eligibility
18 Years to 85 Years · Female only
Enrollment
25 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2023
U.S. locations
1
States / cities
Pomona, California
Source: ClinicalTrials.gov public record
Updated Jul 6, 2023 · Synced Sep 5, 2026, 3:36 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Physiological Effects of Androstadienone Exposure

NCT00553384
View directory record Official record
Conditions
Healthy
Interventions
Not listed
Lead sponsor
Rockefeller University
Other
Eligibility
18 Years to 35 Years · Female only
Enrollment
68 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 Feb 19, 2012 · Synced Sep 5, 2026, 3:36 PM EDT
Completed Phase 2 Interventional Results available

Smell in COVID-19 and Efficacy of Nasal Theophylline (SCENT 3)

NCT05947643
View directory record Official record
Conditions
COVID-19
Interventions
theophylline, Placebo
Drug
Lead sponsor
Washington University School of Medicine
Other
Eligibility
18 Years to 75 Years
Enrollment
77 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2025
U.S. locations
1
States / cities
St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated Aug 19, 2025 · Synced Sep 5, 2026, 3:36 PM EDT
Not listed Not applicable Interventional

"Platelet Rich Plasma for the Management of Post-Viral Olfactory Dysfunction.

NCT05666492
View directory record Official record
Conditions
Olfactory Disorder, Olfaction Disorders
Interventions
Platelet rich plasma, Saline
Other
Lead sponsor
Thomas Jefferson University
Other
Eligibility
18 Years and older
Enrollment
120 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2024
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Dec 26, 2022 · Synced Sep 5, 2026, 3:36 PM EDT