| Not Yet Recruiting | The Efficacy of Olfactory Training Intervention on Olfactory and Other Non-motor Symptoms in PD NCT06607653 | Anhui Medical University | N/A |
| Recruiting | Study of Chemosensory Enhancement Through Neuromodulation Training (SCENT for Long COVID) NCT05855369 | Medical University of South Carolina | Phase 2 / Phase 3 |
| Unknown | Olfactory Performance in Culinary Arts Students NCT06066307 | Leigh Sowerby | Phase 4 |
| Withdrawn | Simvastatin Nasal Rinses for the Treatment of COVID-19 Mediated Dysomsia NCT05542095 | Washington University School of Medicine | Phase 1 |
| Recruiting | Sinus Disease in Young Children With Cystic Fibrosis NCT06191640 | University of California, Los Angeles | — |
| Recruiting | Prospective Registery of Smell/Taste Clinic Ear/Nose/Throat NCT06456008 | Universitaire Ziekenhuizen KU Leuven | — |
| Completed | Stellate Ganglion Block for COVID-19-Induced Olfactory Dysfunction NCT05445921 | Washington University School of Medicine | Phase 1 / Phase 2 |
| Unknown | "Platelet Rich Plasma for the Management of Post-Viral Olfactory Dysfunction. NCT05666492 | Thomas Jefferson University | N/A |
| Unknown | The Efficacy of Traditional Chinese Medicine in Olfactory Dysfunction NCT05448898 | Eye & ENT Hospital of Fudan University | N/A |
| Completed | Efficacy of Gabapentin for Post-Covid-19 Olfactory Dysfunction NCT05184192 | Washington University School of Medicine | Phase 2 |
| Withdrawn | Fluvoxamine to Augment Olfactory Recovery For Long COVID-19 Parosmia NCT05216614 | Washington University School of Medicine | Phase 2 |
| Recruiting | Olfactory Outcomes of Dupilumab Treatment for Nasal Polyposis NCT04869436 | London Health Sciences Centre Research Institute OR Lawson Research Institute of St. Joseph's | Phase 4 |
| Completed | Intranasal Injection of PRP Versus Saline for Treatment of Olfactory Dysfunction NCT04406584 | Stanford University | N/A |
| Completed | Radiofrequency Intervention in Neurological Pathologies Post COVID-19 NCT04920890 | Clinica Gema Leon | N/A |
| Recruiting | Oral and Olfactory Complications of Recovered COVID-19 Patients NCT04791436 | University of Giessen | — |
| Unknown | Olfactory Training for Olfactory Dysfunction After Coronavirus Disease - 19 (COVID-19) NCT04764981 | Universidade do Estado do Pará | N/A |
| Completed | Smell in Covid-19 and Efficacy of Nasal Theophylline NCT04789499 | Washington University School of Medicine | Phase 2 |
| Completed | Correlation of Preoperative Global Olfactory Function With Frailty, Perioperative Neurocognitive Disorders and NCT04761458 | Cliniques universitaires Saint-Luc- Université Catholique de Louvain | N/A |
| Withdrawn | Anosmia Rehabilitation in Patients Post Coronavirus Disease (COVID 19) NCT04374474 | London Health Sciences Centre Research Institute OR Lawson Research Institute of St. Joseph's | Phase 4 |
| Completed | The ESTxENDS Trial- Substudy on Effects of Using Electronic Nicotine Delivery Systems (ENDS) on Olfactory Func NCT04617444 | University of Bern | N/A |
| Completed | Correlation of Preoperative Olfactory Identification Function With Frailty and Postoperative Complications and NCT04700891 | Cliniques universitaires Saint-Luc- Université Catholique de Louvain | N/A |
| Completed | Assessment of Olfactory Dysfunction in SARS CoV-2 (COVID-19) Infection NCT04466982 | Cambridge University Hospitals NHS Foundation Trust | — |
| Unknown | Clinical and Immunological Responses After SARS-CoV-2 Infection Causing COVID-19 NCT05038475 | Association "Naso Sano" Onlus | — |
| Enrolling By Invitation | Olfactory Training in Various Populations NCT06115291 | University of Kansas Medical Center | N/A |
| Completed | CAncer, NUtrition and Taste - Validation of the CANUT-QVA Questionnaire on Eating Habits in Cancer Patients NCT04235153 | Hospices Civils de Lyon | — |
| Completed | Smell Changes & Efficacy of Nasal Theophylline NCT03990766 | Washington University School of Medicine | Phase 2 |
| Completed | Olfactory Function and Olfactory Bulb Volume in Acromegaly Patients NCT04138537 | Bezmialem Vakif University | N/A |
| Completed | At-Home Olfactory Training NCT03611673 | University of Kansas Medical Center | N/A |
| Completed | Steroid Nasal Irrigation for Flavor Evaluation and Detection Study NCT02985515 | Washington University School of Medicine | N/A |
| Unknown | Intranasal Retinoic Acid Treatment for Patients With OlfactoryLOSS: A RANDOMIZED CONTROLLED TRIAL NCT03574701 | St. Paul's Hospital, Canada | N/A |
| Completed | cAMP (Cyclic Adenosine Monophosphate) Levels in the Nose NCT01332825 | University of Washington | N/A |