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This review project aims to systematically examine how personal vulnerabilities have been defined and studied within the Job Demands–Resources (JD-R) model. Despite JD-R’s widespread use, the construct of personal vulnerabilities has remained underexplored and inconsistently applied across studies. In some cases, personal vulnerabilities are treated as stable personality traits (e.g., perfectionism), while in others they are conceptualized as more situational or variable. Their theoretical role within JD-R applications also differs, ranging from predictors of job strain to moderators of job demands, while in many instances they are not included at all. The purpose of this review is to synthesize and clarify the fragmented literature. Specifically, it will provide an overview of how personal vulnerabilities have been defined, what characteristics they have been associated with (e.g., emotions, traits, behaviors), whether they are framed as stable or variable, and how they have been distinguished from personal resources. In addition, the review will map how personal demands have been positioned within JD-R applications and what outcomes they have been linked to, such as strain, burnout, or impaired well-being. By bringing together this scattered evidence, the review will provide a clearer picture of how personal demands have been conceptualized and used in the JD-R literature.