Serum Vitamin D Concentration Is Lower in Patients with Tinnitus: A Meta-Analysis of Observational Studies.

Although we could only find a limited number of observational studies linking serum Vit D with presence or absence of tinnitus ( n = 3, with four cohorts, with one including 300 out of 468 individuals), the results emerged from of our meta-analysis reveal that serum Vit D levels displayed a decreasing trend in all such studies in patients with tinnitus compared to those without ( Figure 1 ).

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