Matsumoto K, Yamada H, Takuma N, et al.
Effects of green tea catechins and theanine on preventing influenza infection among healthcare
workers: a randomized controlled trial.
BMC Complement Altern Med. 2011 Feb 21;11:15.
Free full text via PubMed Central.
To determine whether taking green tea catechins and theanine can clinically prevent influenza infection, researchers from University of Shizuoka, White Cross Nursing Home, and ITO EN, Ltd. conducted a randomized, double-blind, placebo-controlled trial of 200 healthcare workers from November 9, 2009 to April 8, 2010 in three healthcare facilities for the elderly in Higashimurayama, Japan.
In this first randomized clinical trial to evaluate the efficacy of green tea catechins and theanine in the prevention of influenza infection, the authors found that consuming catechin/theanine for 5 months had a statistically significant preventive effect on clinically defined influenza infection and was well tolerated.
The study was supported by a grant from the Japanese Ministry of Health, Labor, and Welfare, and a grant from ITO EN Ltd. ITO EN Ltd played a role in providing the experimental supplements.
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