Background: Anemia is a significant public health problem among adolescent girls in Indonesia that contributes to the risk of stunting. The program of providing blood supplement tablets to adolescent girls is an intervention in the National Strategy for Accelerating Stunting Reduction Program (PPS). There are still gaps in the implementation of the program in Magelang City. Objective: To evaluate the effectiveness of the blood supplementation programme among adolescent girls and find the root causes of the problem and alternative solutions. Methods: This research is a mixed-methods research of triangulation type along with purposive sampling technique. Quantitative data were collected through questionnaires and analyzed descriptively. Qualitative data through in-depth interviews and focus group discussions were recorded and transcribed verbatim and then categorized according to the Donabedian framework - inputs, processes, and outputs and then triangulated and comprehensively analyzed. Results: The iron supplementation program achieved 72% of the national target. The evaluation showed no dedicated budget, inadequate human resources, infrastructure and planning. There were no standard operating procedures, and reporting and monitoring were ineffective. There was variability in drug administration standards and screening systems. In addition, there is a lack of knowledge about anemia and medication adherence. Conclusion: The current iron supplementation program for adolescent girls is not effective. Improvements in the regulatory framework, SOP development, human resource capacity, and cross-sectoral coordination are needed for the success of the program. Efforts to increase awareness education on anemia and the importance of medication adherence should be intensified.
                        
                        
                        
                        
                            
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