| Ginkgo biloba | Cochrane Database of Systematic Reviews: Ginkgo biloba for tinnitus | Tinnitus compared with placebo. The review pooled 12 studies with 1,915 participants and found little to no effect, with uncertain evidence. | No established benefit for tinnitus. Possible interaction with blood-thinning medicines. | Not stated on this page. Confirm on the Supplement Facts panel. |
| L-arginine | Nutrients: L-Arginine and Nitric Oxide in Vascular Regulation | Nitric oxide and blood vessel function, studied in the context of blood donation. | Not a hearing study. Does not show that a supplement improves hearing. | Not stated on this page. Confirm on the Supplement Facts panel. |
| Ashwagandha | Liver International: Ashwagandha-induced liver injury, a case series | Reported cases of liver injury in Iceland and the US Drug-Induced Liver Injury Network. | A safety signal, not evidence of benefit for hearing or tinnitus. | Not stated on this page. Confirm on the Supplement Facts panel. |
| Mucuna pruriens | Journal of Neurology, Neurosurgery & Psychiatry: Mucuna pruriens in Parkinson's disease | Levodopa content and its effects in Parkinson's disease. | Not a hearing study. Can affect dopamine pathways and interact with some medicines. | Not stated on this page. Confirm on the Supplement Facts panel. |
| Maca root | BMC Complementary and Alternative Medicine: Maca for improving overall function | A systematic review of maca for general function. | Not specific to hearing. Findings vary by preparation and purpose. | Not stated on this page. Confirm on the Supplement Facts panel. |
| Vitamins, minerals and antioxidants | Antioxidants: Hearing Loss and Oxidative Stress, a Comprehensive Review | How oxidative stress relates to hearing damage. | Does not prove that a supplement can prevent or reverse hearing loss. | Not stated on this page. Confirm on the Supplement Facts panel. |