The findings, published in Frontiers in Neurology, add to a growing body of evidence linking vitamin D status to inner ear function, hearing loss, and vestibular disorders, raising questions about whether vitamin D may play a role in the biological pathways underlying tinnitus.
Study Design and Key Findings
The study, led by Molnár and colleagues, evaluated 350 patients with primary subjective tinnitus and compared them with 347 control participants without tinnitus. All participants underwent otorhinolaryngological examination, audiological testing, and laboratory analysis, including measurement of serum 25-hydroxyvitamin D3, the primary circulating form of vitamin D.
Low vitamin D3 levels were observed in 53.2% of individuals in the tinnitus group, compared with 31.7% of participants in the control group.
When vitamin D3 concentrations were analyzed as continuous values, the tinnitus group demonstrated significantly lower levels overall.
Adjusting for age and gender, the authors reported that lower vitamin D3 levels significantly predicted the presence of tinnitus. Reduced vitamin D3 was also associated with increased odds of moderately severe and severe tinnitus, as measured by the Tinnitus Handicap Inventory (THI), as well as with chronic tinnitus lasting longer than three months.
Receiver operating characteristic (ROC) analysis further indicated that lower vitamin D3 levels were a significant predictor of tinnitus occurrence, with a reported sensitivity of approximately 76%.
The study did not find significant associations between vitamin D3 levels and tinnitus loudness or laterality.
Vitamin D and Inner Ear Function
Vitamin D is best known for its role in calcium absorption and bone health, but it also plays important roles in neurological, immune, and cardiovascular function. Vitamin D receptors are widely distributed throughout the body, including in brain tissue and within structures of the inner ear.
The inner ear depends on tightly regulated ionic and fluid environments to support hearing, balance, and spatial orientation. Prior research has demonstrated that vitamin D receptors are present in the cochlea and vestibular organs, and that alterations in vitamin D signaling may affect inner ear development and function.
Earlier epidemiological studies have linked vitamin D deficiency to sensorineural hearing loss across the lifespan, including increased odds of bilateral hearing loss in older adults and higher rates of hearing loss in children with vitamin D deficiency.
Vitamin D deficiency has also been associated with subtle changes in cochlear function, including reduced otoacoustic emissions, which may precede changes detectable on standard audiometric testing.
Beyond hearing, vitamin D deficiency has been more extensively studied in vestibular disorders, particularly benign paroxysmal positional vertigo (BPPV). Multiple studies and meta-analyses have shown that vitamin D deficiency is associated with higher recurrence rates of BPPV and that supplementation in deficient individuals may reduce recurrence risk.
These findings have increased interest in vitamin D as a potentially modifiable systemic factor affecting inner ear health.
Possible Mechanisms Linking Vitamin D and Tinnitus
While the current study does not establish causality, the authors discuss several biological mechanisms that may help explain the observed associations. Vitamin D is known to influence neuroinflammatory pathways, calcium metabolism, and neurotrophic factors involved in neural survival and plasticity.
Tinnitus is increasingly understood as a condition involving both peripheral and central auditory mechanisms, including altered neural gain and maladaptive plasticity. Vitamin D deficiency could theoretically contribute to these processes through effects on cochlear function, auditory nerve signaling, or central auditory pathways.
Vitamin D also plays a role in immune regulation and vascular health, which may be relevant given emerging evidence linking tinnitus to neuroinflammation and microvascular dysfunction. However, these mechanisms remain speculative and require further investigation.
Clinical Implications and Study Limitations
The authors emphasize that the study’s observational design limits conclusions about cause and effect. It remains unclear whether vitamin D deficiency contributes to the development of tinnitus, whether tinnitus-related lifestyle factors influence vitamin D levels, or whether both are influenced by additional confounding variables.
Other limitations include the lack of data on sun exposure, seasonal variation, dietary intake, supplementation, and psychiatric comorbidities, all of which may affect vitamin D status and tinnitus perception.
Despite these limitations, the findings suggest that vitamin D status may warrant further consideration in tinnitus research. The authors note that prospective studies and randomized controlled trials are needed to determine whether vitamin D supplementation has a therapeutic role in tinnitus management.
Looking Ahead
Tinnitus remains a complex and multifactorial condition, often without an identifiable cause. This study contributes to a broader shift toward examining systemic and metabolic factors that may influence tinnitus onset and severity, alongside auditory and neurological mechanisms.
While vitamin D supplementation cannot be recommended as a tinnitus treatment based on current evidence, the growing body of research linking vitamin D to inner ear disorders highlights the need for continued investigation into potentially modifiable biological risk factors.
References:
- Molnár A, Mavrogeni P, Mavrogenis A, Maihoub S. Levels of 25-hydroxyvitamin D3 in individuals with primary subjective tinnitus and their associations with tinnitus occurrence and severity. Frontiers in Neurology. 2026;16:1751366. doi:10.3389/fneur.2025.1751366.
- Workman B. Vitamin D and the Ear. Dizziness Depot. Hearing Health & Technology Matters. March 22, 2023.
