This report, published by the World Health Organization and UNICEF in 2019, presents findings from key informant interviews, an online survey, and DHS data analyses concerning antenatal iron supplement indicators. It aims to improve the global standardization and reporting of antenatal indicators, particularly focusing on iron supplement provision to adolescent girls, pregnant, and lactating women. The document examines the availability and use of iron supplements in health facilities, and the collection and use of related data across various countries. It also discusses the challenges and feasibility of using current data sources for accurate reporting. The report targets policymakers, health professionals, and organizations involved in maternal and child health, providing insights and recommendations for enhancing data quality and indicator development.