https://sites.google.com/site/alternativemedicinesolutions/tinnitus United States Patent 5989558 - Method of using rosmarinus officinalis for treating various diseases ...The patients were given one gelatin capsule containing 150 milligrams of Rosmarinus officinalis dried total extract orally every 12 hours (300 milligrams/day) for 30 days. The effects were evaluated in clinical studies... ...The symptoms of dizziness and nausea disapeared after 30 days treatment in 100% of the patients. Tinnitus, or ringing in the ears, was alleviated in 95% of the patients. Poor hearing was successfully treated in 86.7% of the cases. Treatment of these diseases of the inner ear with Rosmarinus officinalis dried total extract was highly effective... Here is the research study and patent information http://www.freepatentsonline.com/5989558.pdf For the tinnitus results see page 8 + 9 It was patented in 1999, so I don't know why we haven't sen more of this therapy.