The mineral crucial for the formation of hemoglobin is iron. Hemoglobin is a protein found in red blood cells responsible for transporting oxygen from the lungs to the body’s tissues and returning carbon dioxide back to the lungs. Iron is a vital component of the heme group within hemoglobin, allowing it to bind and release oxygen effectively. A deficiency in iron can lead to anemia, reducing the efficiency of oxygen transport in the body and resulting in fatigue and other health issues.