Synopsis

Source of validity: Scientific
Rating (out of 5): 1

Vitamin B12 (especially in the form of hydroxycobalamin) has been investigated in relation to hearing loss, particularly sensorineural hearing loss. There is a biological rationale: B12 is crucial for nerve health and myelin synthesis, and its deficiency can cause neurological symptoms, including auditory nerve dysfunction. Some small studies and case reports have found that individuals with B12 deficiency may experience hearing loss, and supplementation can sometimes improve auditory function if deficiency is present. However, large, high-quality randomized controlled trials are lacking. The majority of evidence comes from observational studies, case reports, or small-scale clinical trials, often in populations specifically identified as B12-deficient. There is not strong evidence that B12 supplementation benefits hearing in those with normal B12 status or that it prevents age-related or noise-induced hearing loss. Current scientific consensus is that B12 supplementation may be justified only in those with proven deficiency and hearing loss, and routine use for hearing loss in the general population is not supported. Thus, while there is a scientific basis for investigation, the clinical evidence is weak and limited.

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