Lived experience as systems-relevant evidence in psychedelic public health.

As psychedelic interventions move from controlled clinical trials into broader implementation, critical dimensions of lived experience among patients, trial participants, families, and caregivers remain systematically undermeasured in research, service design, and oversight. The resulting gap between protocol-defined outcomes and real-world experiences over time creates blind spots in current approaches, particularly regarding safety, care quality, post-treatment stabilization, aftercare, and long-term vulnerability. I argue that lived experience is a form of systems-relevant evidence essential to strengthening decision-making and institutional accountability. I propose a public health framework for integrating lived experience and expertise into psychedelic research, care models, and governance. Integrating these forms of experiential knowledge can enhance outcome visibility beyond standard clinical measures and adverse event reporting by identifying both beneficial changes and emerging risks across care pathways that might otherwise remain obscured. Finally, I outline key implications for program evaluation, workforce development, and policy design. A rigorous psychedelic public health strategy requires stronger mechanisms for understanding safety and long-term efficacy to ensure that implementation both optimizes outcomes and provides accountability and protection.