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This work identifies the differences in the relevance of online endorsers' physical attractiveness and expertise depending on whether an endorsed product is related to attractiveness. It provides a new perspective regarding the source-credibility model and explores unprecedented relationships. To date, many studies investigating online endorsers have focused on attractiveness-related products, but online endorsers are also employed for attractiveness-unrelated products. Practitioners therefore need to know which requirements are relevant to attractiveness-unrelated products. However, no existing study has compared online endorsers of attractiveness-related or attractiveness-unrelated products. Our investigation is based on an empirical experiment including 576 participants, analyzed with structural equation modeling. The subsamples are compared by multigroup analysis, resulting in counterintuitive results. Both online endorsers and practitioners can greatly benefit from our findings. Our findings indicate that attractiveness is a relevant requirement for both types of products, although attractiveness has a stronger impact on brand-related variables of attractiveness-related products. Male attractiveness is also more relevant than female attractiveness regarding attractiveness-related products. Concerning expertise, we find no differences between the two types of products. [ABSTRACT FROM AUTHOR]