User-generated content is becoming increasingly popular, especially on online shopping platforms like TikTok Shop, where product reviews can greatly influence consumer actions. Consequently, the credibility of reviews is essential, as it affects customers’ intentions and online purchasing behaviours. This study aims to explore the factors that influence review credibility and consumers’ purchase intentions on the TikTok Shop platform in Vietnam. It specifically focuses on the impact of reviewer expertise, reviewer reputation, review quantity, review consistency, and product popularity. A survey was conducted with 334 consumers who shopped on TikTok Shop after watching review videos. Data analysis using Structural Equation Modeling (SEM) revealed that reviewer reputation had the strongest influence on review credibility, which, in turn, significantly affected consumers’ purchase intentions. Additionally, review quantity and reviewer expertise positively influenced review credibility, while review consistency and product popularity did not show a significant impact. Based on these findings, the study provides recommendations to enhance the customer experience and mitigate the risks associated with online shopping on the platform.