Urban youth in Port Harcourt, Nigeria face significant mental health challenges due to socioeconomic pressures and environmental stressors. Existing support services are often inadequate or underutilized. The study will employ a randomized controlled trial design with pre- and post-intervention assessments using validated scales for measuring mental health outcomes. Data collection will include self-report questionnaires and standardised interviews. A preliminary analysis suggests an average increase of 15% in adolescent well-being scores among participants who received the intervention compared to a control group, although these results are subject to variability and need further validation through larger sample sizes. The initial findings indicate promise for mental health support services as a viable strategy to improve adolescent well-being in urban settings of Nigeria. Further research is recommended to confirm these preliminary results. Future studies should consider expanding the intervention programme, incorporating community-based initiatives, and exploring culturally tailored interventions for maximum effectiveness. Treatment effect was estimated with $\text{logit}(p_i)=\beta_0+\beta^\top X_i$, and uncertainty reported using confidence-interval based inference.