Adolescents in Nairobi slums face unique challenges related to mental health due to socio-economic pressures and limited access to support services. The study employed a mixed methods approach combining qualitative interviews with focus groups (n=15) and quantitative surveys (n=200), conducted over two years in Nairobi slums. Peer facilitation significantly enhanced group cohesion and participant engagement, with themes of mutual support and problem-solving emerging from qualitative data. Peer-facilitated support groups provided a safe space for adolescents to discuss mental health issues and develop coping strategies. Further research should explore the long-term impact and scalability of peer facilitation models in similar contexts, with potential roll-out plans for implementation.