Factors Influencing Consumers’ Perceived Healthiness and Willingness to Use Functional Drinks in Thailand Thitarat Worawitphinyo* Master of Business Administration (Business Modeling and Analysis) Thailand *e-mail: t.wphinyo@gmail.com Abstract The aims of the present study were to determine factors that influence consumers’ perceived healthiness and willingness to use functional drinks in Thailand. A study was carried out in Bangkok over the period of August to October 2013 to investigate determinants of functional drink use. The survey canvassed the views of 400 respondents, and the completed questionnaires were subsequently used in the analysis. The results indicated that Thai consumers’ attitude towards functional drinks, consumers’ perceived healthiness of ingredients, and consumers’ perceived credibility of information source had an influence on the willingness to use functional drinks. 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