Plain-English translation of NCT05539560 on ClinicalTrials.gov ↗ · Source last updated · Translation generated · How we translate trials
This study doesn't follow the usual testing phases — it may be an observational study or a different type of research.
Some people lose their sense of smell after COVID-19, and it doesn't always come back on its own. This study is testing whether a simple twice-daily practice called olfactory training—where you inhale and focus on specific scents—can help restore your sense of smell. Half of participants will use real essential oils (orange, lavender, clove, and peppermint), while the other half will use fragrance-free oils, so researchers can see which approach works best.
Losing your sense of smell after COVID-19 can affect quality of life and eating enjoyment, and there are limited proven treatments available. This trial aims to find out whether olfactory training with real scents is more effective than training alone in helping people recover this important sense.
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You will be assigned to either the essential oil group or the fragrance-free oil group. Over three months, you'll inhale each of your four assigned oils for 30 seconds every morning and evening, keeping a diary to track your practice. You'll visit the hospital's smell and taste clinic at the start and end of the study for standardized smell tests and to complete a questionnaire about how the training affects your daily life.
AI-generated summary from trial data · Jun 6, 2026 · Not medical advice
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