Petridou AI, et al. (2019) "The Effect of Antioxidant Supplementation in Patients with Tinnitus and Normal Hearing or Hearing Loss: A Randomized, Double-Blind, Placebo-Controlled Trial." Nutrients. PMID: 31842394
Yeh CW, et al. (2019) "Effects of oral zinc supplementation on patients with noise-induced hearing loss associated tinnitus: A clinical trial." Biomed J. PMID: 30987704
Person OC, et al. (2016) "Zinc supplementation for tinnitus." Cochrane Database Syst Rev. PMID: 27879981
Bovo R, et al. (2006) "Zinc for tinnitus, imbalance, and hearing loss in the elderly." Acta Otolaryngol. PMID: 16923703
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These citations refer to research on individual ingredients and on general hearing nutrition, not to the ZenCortex product, which has not undergone its own clinical trial. Studies frequently use doses or preparations that differ from those in this formula, and some findings (such as on zinc) are mixed. ZenCortex is a dietary supplement; these statements have not been evaluated by the FDA and are not intended to diagnose, treat, cure or prevent any disease.