Ginkgo Biloba and Dr. Shelton's hearing loss/tinnitus supplements that help improve blood flow and fight toxins are probably are very situational, and how do we know the improvement of blood flow will specifically target in the cochlea in a potent way? It's not like the ingredients are injected inside the inner ear through the round window.
Be skeptical of people who claim Ginko Baloba will treat hearing loss, and tinnitus, the results are very inconsistent. The rare exception would be interesting to find though so we know what small subtype of patients will benefit.