Transformative service design is dominated by expert-driven design solutions which, as is evidenced in the current context of alcohol education, might not successfully capture user needs. Responding to the call for exploring possible alternatives to conventional design approaches, this study investigates how users can be involved through co-design and what contributions they can make during this process. A six-step co-design process was used to collect and evaluate the qualitative data. Findings show that the recruitment and facilitation stages are key to the success of co-design sessions. Additionally, it was found that the user-designed programs differed from previously expert-designed programs, namely in terms of the delivery platforms used, duration of the program, and the level of adolescent involvement. Ultimately, the study shows that co-design, if fully utilised and users are empowered to contribute actively, can allow for the design of transformative services that are more aligned to the specific user needs.