What is the use for iron in human blood?

Iron is an essential mineral for human health and is found in many parts of the body, including the blood. It is an important component of hemoglobin, a protein in red blood cells that carries oxygen from the lungs to the rest of the body. Without enough iron, the body cannot produce enough hemoglobin, leading to iron deficiency anemia. This condition can cause a range of symptoms, including fatigue, weakness, pale skin, shortness of breath, and dizziness. In severe cases, it can lead to heart failure.