This toolkit includes an impact evaluation of the Aksi Bergizi pilot programme, facilitator and student guides, the social and behavior change communication strategy, and additional intervention resources (available in Indonesian only).Aksi Bergizi includes three evidence-based interventions including weekly iron–folic acid supplementation, school-based nutrition education sessions promoting healthy eating and physical activity, and a comprehensive social behaviour change communication, which were tested in two districts in Indonesia. The results of the impact evaluation demonstrated significant improvement in adolescent knowledge, attitude and behaviours including consumption of weekly iron folic acid supplementation, their physical activity behaviour and intake of healty diets including fruits and vegetables. The Aksi Bergizi intervention is intended for nationwide scale-up in 2021 using the national school health programs as a platform.