The goal of this clinical trial is to assess the effectiveness of a suicide prevention training program (Gatekeepers) tailored to university students in Spain. The main questions it aims to answer are: * Does the training program improve suicide-related knowledge, attitudes, perceived behavioral control, and gatekeeper behaviors among students? * Are there differences in training outcomes by gender, and how do they affect program engagement and effectiveness? Researchers will compare a Immediate Intervention Group (GTK-IG), which will receive the full training immediately, with a 2) the Delayed Intervention Group (GTK-DG), which will be a waitlist control during the first phase of the study, to evaluate the program's short- and medium-term impact, using both in-person and online formats. which will be a waitlist control during the first phase of the study. Participants will: * Be randomly assigned to the intervention or control group, choosing between in-person or online training * Complete online surveys at three timepoints: before the program (T0), immediately after (T1), 2-3 months later (T2), and 9-12 months follow-up (T3). * Attend two 3-hour training sessions covering key suicide prevention competencies * Participate in a follow-up session with focus group discussion to qualitatively assess retention and use of learned skills * Complete validated questionnaires on suicide prevention literacy, attitudes, stigma, and self-reported gatekeeper behaviors This trial includes validation of the Spanish versions of the WISE (Willingness to Intervene Against Suicide Enhanced Questionnaire) and ACT as Gatekeeper measures. The study is registered at ClinicalTrials.gov and follows CONSORT and SPIRIT guidelines. Ethical approval was granted by the Human Research Ethics Committee at the University of Valencia.
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Change in Willingness to Intervene Against Suicide (WISE) Score from Baseline to 2-Month Follow-Up
Timeframe: From baseline (T0) to T1 (2 weeks after T0), with a 2-3month follow-up at T2 (approximately 2.5 months after T0) and a follow-up at 9-12 months from T1 (T3)
Self-Reported Gatekeeper Behaviors Using ACT as Gatekeeper Scale from Baseline to 2-Month Follow-Up
Timeframe: From baseline (T0) to T1 (2 weeks after T0), with a 2-3month follow-up at T2 (approximately 2.5 months after T0) and a follow-up at 9-12 months from T1 (T3).