The value and effectiveness of youth peer support for young people struggling with mental health or problematic substance use are becoming more widely recognized (de Beer, Nooteboom, van Domburgh, et al (2022) however, embedding peer support services into mainstream behavioral healthcare remains challenging. The research indicates that youth peer supporters help to better engage youth in services, mitigate the perception of stigma, and are highly dedicated to the work given their lived experience. This presentation focuses on a well-developed peer group model for youth and young adults that is being implemented in New Hampshire, with promising results. The model uses a harm reduction rather than an abstinence-only approach to substance use and includes a robust training and support model for peer leaders and trainers and a data decision system for process improvement and program evaluation.