The goal of this pilot study is to assess the feasibility and impact of using sodium citrate nasal spray as an adjunct to olfactory retraining in participants with long-term post-COVID-19 olfactory dysfunction. The main questions it aims to answer are: * Is sodium citrate nasal spray in addition to smell retraining feasible for participants to use in terms of participant need/desire, adherence, and adverse events? * Does sodium citrate nasal spray in addition to smell retraining further improve smell as compared to normal saline spray and smell retraining? Participants will: * Provide consent for enrollment. * Undergo smell testing via Sniffin' Sticks. * Use a nasal spray (either sodium citrate or normal saline) followed by olfactory retraining twice a day for 12 weeks. * Return for follow-up Sniffin' Sticks testing. Researchers will compare the sodium citrate group and the normal saline group to determine differences in smell improvement.
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The Number of Eligible Patients
Timeframe: 1 year
The Proportion of Participants Who Were Enrolled in the Study
Timeframe: 1 year
The Proportion of Participants Who Complete the Study
Timeframe: 1 year
Proportion of Participants Who Report Minor or Severe Adverse Events
Timeframe: 1 year
Adherence Rate Distribution
Timeframe: 1, 4, 8, and 12 weeks