I found that zinc is the only thing that really helps with my tinnitus.
(zinc + methylcobalamin + ginkgo biloba is a good treatment)
I have been taking 50 mg for 5 days now.
How much is too much?
This study used the same dosage daily for two months. [url]http://www.ncbi.nlm.nih.gov/pubmed/12544035[/url]