Introduction: In spite of adolescents' rights to be involved in decisions that concern their health and life, limited research has been published reporting on their involvement in mental health research. Therefore, we aim to present experiences and reflections based on the involvement of adolescents in mental health research, to describe the collaborative relationship between researchers and coresearchers, including the values that underpin their collaboration.Methods: An autoethnographic approach was used, combined with group reflections. The process was jointly developed, carried out and analysed by adolescent coresearchers and the project's lead researcher over a period of 2 years. The article is jointly authored by the researcher and the ten coresearchers. Results: Six themes were developed to describe our collaborative relationship, resulting in the involvement of adolescents in decisions about research priorities; in planning and carrying out the research; through to analysis, dissemination and communication of results. The themes include: (1) Commitment motivated by altruism, personal interests and a common purpose; (2) Inclusiveness and support to reduce social uncertainty and strengthen collaboration; (3) Reduced power differentials while ensuring clarity of roles and tasks; (4) Diversity in representation to expand the perspectives of 'the adolescent voice'; (5) Self-determinationsupporting adolescents' involvement in decision-making processes; and (6) Flexible and systematic project management. The themes describe the collaboration, the underlying values and motives, the challenges faced and how they were overcome.

Introduction Despite increased focus on development of mental health services worldwide, many adolescents still hesitate to reach out to the services when they need them. This might be linked to the lack of adolescent involvement in the development of services. This study aimed to explore adolescents' perspectives on the ideal healthcare services to meet their mental health needs. Methods A two‐stage qualitative study was carried out to explore the perspectives of adolescents on the healthcare services to support their mental health. In the first stage, data from 295 adolescents attending a mental health seminar were analysed using qualitative content analysis. In the second stage, in‐depth perspectives of 10 adolescent coresearchers were gathered through self‐reflection and group discussions to further explore the categories developed in the first stage. Thematic analysis was used to develop the themes answering the research question. Ten adolescent coresearchers planned the study, collected and analysed data and authored the manuscript, with the support of a senior researcher. Results Five themes describe adolescents' perspectives on the ideal healthcare services to meet their mental health needs: (1) Culturally Sensitive and Responsive; (2) Communication of Information; (3) Easy Access; (4) Variety of Support; and (5) Consistency. Culturally Sensitive and Responsive services influenced all other themes. The themes describe suggestions for mental health service improvement, including how to manage the barriers that adolescents face to receive help from the mental health services. Discussion This study highlights the importance of culturally sensitive and responsive services. It raises the need for an expanded definition of culture going beyond nationality and ethnic background. Adolescents need flexible services that meet their individual mental health needs. This has implications for practitioners, educators, system organizers and researchers, who should also involve adolescents in planning, implementing and assessing the services. There is a need for a self‐learning system to continuously adapt to user feedback. Conclusion This study provides insight into adolescents' perspectives on the ideal mental health services. It offers suggestions for ways to improve services to better meet the individual mental health needs of adolescents. Additional research is needed to further develop and implement service changes, as well as to assess their acceptability, effectiveness, cost‐effectiveness and safety. Patient or Public Contribution This is a study lead by adolescents. Adolescent coresearchers have, with the support of a senior researcher, planned and carried out the study, collected and analysed data and authored the manuscript.

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