Patients treated with the addition of vitamin E achieved better recovery than did the control patients. 
https://pubmed.ncbi.nlm.nih.gov/12851547/

Effects of erinacine A-enriched Hericium erinaceus on elderly hearing-impaired patients: A double-blind, randomized, placebo-controlled clinical trial
https://tcu.elsevierpure.com/en/publications/effects-of-erinacine-a-enriched-hericium-erinaceus-on-elderly-hea-2