Dekker, K., & Van Reijmersdal, E. A. (2013). Disclosing celebrity endorsement in a television program to mitigate persuasion: How disclosure type and celebrity credibility interact. Journal of Promotion Management, 19(2), 224-240. doi: 10.1080/10496491.2013.769473

Abstract: This experiment (N = 165) examined the effects of two aspects of in-program celebrity endorsement on brand attitudes and product claim acceptance: credibility of the celebrity and the effects of disclosure types. Although there is an increasing call for endorsement disclosures, the effects of these disclosures remained unstudied. This study, conducted in The Netherlands, showed that disclosure of the persuasive intent of in-program celebrity endorsements only resulted
in reduced acceptance of product claims among viewers who did not perceive the celebrity in the endorsement as credible. This study has important implications for legislators.