Effect on O-Methylated Catechin for Allergic Rhinitis

Objective Benihuuki is a kind of Japanese green tea with high O‐methylated catechin content. The purpose of this study is to demonstrate the effect of Benihuuki on allergic rhinitis induced by cedar pollen. We evaluate the effect of Benihuuki and Yabukita without O‐methylated catechin. Method Two kinds of Benihuuki and Yabukita green tea were prepared for allergic rhinitis induced by cedar pollen. The subjects were asked to drink tea 2 times a day, following tea making instruction. The effect of those green teas was evaluated with immunological examination, blood sample test, and rhinomanometry. Results Both Benihuuki and Yabukita were effective for the improvement of nasal obstruction. Benihuuki has more potential for improvement of nasal obstruction. Improvement of life disability caused by allergic rhinitis was more significantly demonstrated in Benihuuki. Conclusion Benihuuki was proven to have high potential for treatment of nasal obstruction due to allergic rhinitis caused by cedar pollen provocation. Benihuuki is one beneficial way to protect against allergic rhinitis induced by cedar pollen.