I take zinc daily to keep from getting viruses. My hearing is fine so I don’t know if it helps that or not.
I likewise take 50mg zinc daily, for the same reasons (immune system, antivirus, etc.).
My hearing is quite compromised from 60 years of playing loud (LOUD!) rock and roll in bands, from high-school garage bands, to large combos in noisy clubs, etc. Can't hear much above 2kHz, and have terrible loud tinnitus. So I have high-end DSP programmable hearing aids (Oticon "More") which are a life saver in conversations and noisy rooms.
I have no idea whether the daily zinc is helping or hurting my hearing, but I believe it's helping keep me healthy, so I intend to continue it.
I take 25 mg of zinc to help prevent colds and it helps! My hearing is ruined anyway but I don’t think it has affected my hearing in any way.