Quick answer: The ingredients are familiar botanicals, amino acids and a trace mineral. Research on each is mixed and limited, and we are not aware of clinical trials on the finished product or on its effect on hearing.
Botanicals
Green Tea, Grape Seed and ginseng-type roots are popular in wellness. See Green Tea and Grape Seed and Ginseng and Adaptogens.
Amino acids and chromium
Amino acids are involved in normal nerve and brain function, but research on supplement doses is mixed. See Amino Acids in Liquid Supplements.
Things to keep in mind
The blend lists around 23 ingredients but does not itemize amounts, so it is hard to judge how much of each is present. Some ingredients (such as raspberry ketones and coleus) are more commonly associated with weight-management products than ear health. We do not claim that Tinizen treats tinnitus or hearing loss.
Bottom line
A transparent-enough ingredient list for suitable adults, with limited evidence for any specific outcome. See our worth-it review and the references.