CellWell record HH-522087
The APOLLO trial: a proof-of-concept study for vitamin A nasal drops in COVID-19-related postinfectious olfactory dysfunction
Zhu Hui Yeap; Rashed Sobhan; Sara L Bengtsson; Saber Sami; Allan B Clark; Ramesh Vishwakarma; James Boardman; Juliet High; Gabija Klyvyte; Mehmet Ergisi; Thomas Hummel; Carl M Philpott
2026
In plain language
In a randomized trial of COVID-19 patients with postinfectious smell loss, intranasal vitamin A drops did not change olfactory bulb volume versus placebo, though quality-of-life scores improved.
- Evidence
- Established
- Design
- Randomized controlled trial
Cite this record: https://thecellwell.org/studies/HH-522087
Produced by the CellWell Research Engine, custom software owned and operated by CellWell and The Holistic Hub. All rights reserved. This analysis, its indexing and its evidence classifications are proprietary. Any use, republication or onward sharing must credit CellWell Research Engine (thecellwell.org) as the source.
This is an educational research library, not medical advice. Nothing here may be used to diagnose, treat, cure, or prevent any disease. Always consult a qualified professional.