Nairobi slums face significant barriers to accessing mental health services, including stigma, lack of awareness, and inadequate infrastructure. A meta-analysis was conducted using data from multiple studies evaluating community-based clinics that provided mental health support. Studies were included based on predefined criteria, and statistical models were employed to analyse the impact of these clinics. Community-based counseling clinics showed a significant increase in service utilization by 30% (95% CI: 20-40%) compared to baseline levels, indicating improved access. The community-based clinics effectively increased mental health service uptake among Nairobi slum residents, demonstrating their potential as viable alternatives to traditional healthcare settings. Future research should explore scalability and sustainability of these clinics in similar urban contexts. mental health services, Nairobi slums, community-based clinics, meta-analysis Treatment effect was estimated with $\text{logit}(p_i)=\beta_0+\beta^\top X_i$, and uncertainty reported using confidence-interval based inference.