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

Published in:	Pilot and Feasibility Studies
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
Subjects:	Smell Vitamin A Olfactory dysfunction Randomised controlled trial
Online Access:	https://doi.org/10.1186/s40814-023-01402-2