Background: The current state of mental health care in the Netherlands faces challenges such as fragmentation, inequality, inaccessibility, and a narrow specialist focus on individual diagnosis and symptom reduction. Methods: A review suggests that in order to address these challenges, an integrated public health approach to mental health care that encompasses the broader social, cultural, and existential context of mental distress is required. Results: A Mental Health Ecosystem social trial seeks to pilot such an approach in the Netherlands, focusing on empowering patients and promoting collaboration among various healthcare providers, social care organizations, and peer-support community organizations, working together in a regional ecosystem of care and committed to a set of shared values. In the ecosystem, mental health problems are examined through the prism of mental variation in context whilst scaling up the capacity of group-based treatment and introducing a flexible and modular approach of (2nd order) treatment by specialists across the ecosystem. The approach is to empower naturally available resources in the community beyond professionally run care facilities. Digital platforms such as psychosenet.nl and proud2bme.nl, which complement traditional mental health care services and enhance public mental health, will be expanded. The capacity of recovery colleges will be increased, forming a national network covering the entire country. GEM will be evaluated using a population-based approach, encompassing a broad range of small-area indicators related to mental health care consumption, social predictors, and clinical outcomes. The success of GEM relies heavily on bottom-up development backed by stakeholder involvement, including insurers and policy-making institutions, and cocreation. Conclusion: By embracing a social trial and leveraging digital platforms, the Dutch mental health care system can overcome challenges and provide more equitable, accessible, and high-quality care to individuals.