A double-blinded randomised controlled trial of vitamin A drops to treat post-viral olfactory loss: study protocol for a proof-of-concept study for vitamin A nasal drops in post-viral olfactory loss (APOLLO)

A double-blinded randomised controlled trial of vitamin A drops to treat post-viral olfactory loss: study protocol for a proof-of-concept study for vitamin A nasal drops in post-viral olfactory loss (APOLLO)

Abstract Background Smell loss is a common problem with an estimated 5% of the population having no functioning sense of smell. Viral causes of smell loss are the second most common cause and the coronavirus (COVID-19) pandemic is estimated to have caused 20,000 more people this year to have a lasti...

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Bibliographic Details
Main Authors: Kala Kumaresan, Sara Bengtsson, Saber Sami, Allan Clark, Thomas Hummel, James Boardman, Juliet High, Rashed Sobhan, Carl Philpott
Format: Article
Language:English
Published: BMC 2023-10-01
Series:Pilot and Feasibility Studies
Subjects:
Smell
Vitamin A
Olfactory dysfunction
Randomised controlled trial
Online Access:https://doi.org/10.1186/s40814-023-01402-2

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