Introduction: The term anemia indicates a low red cell count and a below normal hemoglobin or hematocrit level. Anemia can be defined as a reduction in hemoglobin concentration, hematocrit or red cell mass. According to the WHO grading of anemia, hemoglobin level (Hb) between 10gm/dl to 12gm/dl is known as mild anemia, Hb level between 7gm/dl and 10gm/dl is known as moderate anemia and Hb level below 7gm/dl is known as severe anemia. Aim: The aim of this narrative review is to find information on the effectiveness of iron supplementation in improving the level of hemoglobin among adolescent girls. Methodology: Intervention- Effectiveness of iron supplement, Types of studies: Quasi experimental, Pre experimental, True Experimental study. Types of participants: Adolescents girls (12-18years) Setting: Government Schools of Greater Noida, Uttar Pradesh. Outcome: This narrative review result has appeared that Iron supplement will be effective to increase the level of haemoglobin.