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85 points with the most significant improvement in the threshold subcomponent. There were no adverse outcomes from intranasal PRP injections. Conclusion PRP appears safe for use in the treatment of olfactory loss, and preliminary data suggest possible efficacy, especially for those with moderate yet persistent loss. Further studies will help determine optimal frequency and duration of use. Level of evidence 2B © 2020 The Authors. Laryngoscope Investigative Otolaryngology published by Wiley Periodicals, Inc. on behalf of The Triological So