Emotion Regulation Difficulties; Risky Behaviors (Substance Use, Risky Sexual Behavior, Self-harm, Aggression, Disordered Eating)

This study aims to investigate the effects of the PsyPills mobile application on improving emotion regulation and reducing risk behaviors among emerging adults. PsyPills is a self-guided psychological intervention based on Rational-Emotive and Behavioral Therapy (REBT) principles and the Just-in-Time Adaptive Intervention (JITAI) framework. The app provides short, contextually adaptive "psychological pills," or cognitive restructuring exercises, designed to help users replace irrational beliefs with rational alternatives in moments of emotional distress. The study will compare PsyPills app with an active control condition using the MoodWheel app, which supports emotional monitoring without therapeutic content.