Effects of Tea Catechin Consumption on the Prophylaxis of Influenza Infection

Masahiro Morikawa

Status

Completed

Conditions

Influenza Infection

Treatments

Dietary Supplement: tea catechin extracts

Study type

Interventional

Funder types

Other

Identifiers

NCT01008020

CT2009002

Details and patient eligibility

About

The Purpose of this study is to evaluate the effects of 5 months catechin consumption on the prevention of influenza infection.

Full description

Catechins are the major components of tea flavonoids and are reported to possess physiological activities such as antiviral effects. Recent experimental studies have revealed that tea catechin extracts prevent influenza infection, but few studies have been conducted on the clinical effects of tea catechin consumption on the prophylaxis of influenza infection. Based on these backgrounds, we designed a prospective randomized controlled study to evaluate the effects of 5 months tea catechin consumption on the prophylaxis of influenza infection.

Enrollment

200 estimated patients

Sex

All

Ages

20 to 90 years old

Volunteers

Accepts Healthy Volunteers

Inclusion criteria

aged over 20 years
possible to maintain without drinking tea more than 250 ml per day during the study
possible to maintain without taking supplements or herbal products including catechin extracts during the study
possible to fill out a questionnaire personally
Obtained written informed consent before participation

Exclusion criteria

Possessing some chronic infectious diseases in need of therapy
Possessing tea or catechin allergy
Possessing a history of influenza infection before six months prior to the study
diagnosed as inadequate for other reasons to participate the study by principal investigator