Adolescent girls are vulnerable to anemia because they experience menstrual cycles and do not consume iron supplements regularly and obediently. Adolescent health must be prepared early, in order to produce productive, creative and competitive teenagers. Adolescent knowledge about iron supplements is very important to determine their behavior in consuming iron supplements. The purpose of this study was to determine the Hb levels of female students at SMKN 18 Pandeglang which is the working area of Cisata District. This study is a mixed method study, namely a combination of Qualitative and Quantitative. Participants consisted of 25 female students who were given an intervention in the form of Iron Supplement Tablets (TTD). Hemoglobin level measurements will be carried out before and after the intervention period. In addition, a structured survey will be conducted to obtain information on dietary patterns, physical activity levels and other factors that can influence the risk of anemia. The analysis used univariate and bivariate analysis. Based on the analysis that has been done, it can be concluded that the Iron Supplement Tablet (TTD) Provision Program at SMA Cisata District has proven effective in reducing the number of anemia in female students. The results showed that the Hb level before iron supplementation was 11.13 g/dL, while the average Hb level after average iron supplementation was 12.74 g/dL. The results of the difference test on Hb levels before and after iron supplementation had a P-value <a, which is 0.000. This concludes that there is a significant difference between Hb levels before and after iron supplementation in adolescent girls at SMKN 18 Pandeglang. The t-test result for this study was -7.113, while the t-table value was 2.021. The t-test result is > t-table, indicating a significant difference. From the above data, it can be concluded that H0 is rejected and Ha is accepted, indicating a relationship between iron supplementation use and hemoglobin levels in adolescent girls.
Keywords: Effectiveness, Knowledge, Adolescents, Iron Supplementation, Anemia