| Lactoferrin for COVID-19-Induced Taste or Smell Abnormality (NCT05760079) | Wake Forest University Health Sciences | 2022-06-01 |
| The Study of Quadruple Therapy Intranasal Insulin, Zinc, Gabapentin, Ice Cube Stimulation for Post COVID-19 Smell and Taste Dysfunctions (NCT05104424) | Ministry of Health, Saudi Arabia | 2021-12-26 |
| Olfaction Changes in Patients Undergoing Spine Surgery (NCT04194788) | I.R.C.C.S Ospedale Galeazzi-Sant'Ambrogio | 2021-04-29 |
| Triggers for Post-Viral Parosmia (NCT04868435) | University of Reading | 2020-11-03 |
| Chinese Multi-provincial Cohort Study-Beijing Project (NCT04253054) | Beijing Institute of Heart, Lung and Blood Vessel Diseases | 2020-09-07 |
| Taste and Smell Impairment in Critically Ill COVID-19 Patients (NCT04532632) | Pinar Ay Sayin | 2020-09-01 |
| Assessment of Olfactory Dysfunction in SARS CoV-2 (COVID-19) Infection (NCT04466982) | Cambridge University Hospitals NHS Foundation Trust | 2020-07-02 |
| Clinical and Immunological Responses After SARS-CoV-2 Infection Causing COVID-19 (NCT05038475) | Association "Naso Sano" Onlus | 2020-05-01 |
| Olfactory Training in Various Populations (NCT06115291) | University of Kansas Medical Center | 2020-02-13 |
| Smell Changes & Efficacy of Nasal Theophylline (NCT03990766) | Washington University School of Medicine | 2019-05-15 |