COVID-19 Anosmia Study

Inclusion Criteria: * Adults (18 years of age or older) with self-reported new-onset olfactory dysfunction * Positive COVID-19 diagnosis will be deemed eligible for inclusion. Exclusion Criteria: * Patients \<18 years of age * Patients who are unable to provide informed consent * Patients without a positive COVID-19 PCR result obtained through nasopharyngeal swab - Patients with a COVID-19 diagnosis but without self-reported anosmia * Patients with severe COVID-19 disease as defined by the Mouth Sinai Health System Treatment Guidelines for SARS-COV-2 (requiring high flow nasal cannula, non-rebreather, CPAP/BIPAP, or mechanical ventilation OR patients requiring pressor medication OR patients with evidence of end organ damage) * Patients with pre-existing self-reported olfactory dysfunction * Patients with a history of chronic nasal/sinus infections (rhinosinusitis) or history of endoscopic sinus surgery * Patients using nasal steroid sprays or irrigations for any reason * Patients who are prisoners of the state * Patients who have psychiatric or developmental disorder conditions that may impair ability to provide informed consent * Patients will also be excluded if they have an allergy to fish or an omega-3 supplement, or do not eat fish or fish- containing substances for any reason