Key Mineral for Red Blood Cells: Iron

The mineral essential for the formation of healthy red blood cells is Iron. It is a critical component of hemoglobin, the protein within red blood cells responsible for transporting oxygen from the lungs to the rest of the body.

Iron Deficiency and Anemia

A deficiency in Iron intake can lead to a condition called iron-deficiency anemia. This occurs when the body doesn't have enough iron to produce the adequate amount of hemoglobin needed for effective oxygen transport, resulting in fatigue and other symptoms.

Analysis of Options

• Iron: Directly involved in hemoglobin synthesis and red blood cell production. Deficiency causes anemia.
• Iodine: Essential for thyroid hormone production.
• Chromium: Plays a role in carbohydrate and lipid metabolism, particularly insulin function.
• Magnesium: Involved in numerous biochemical reactions, including muscle and nerve function, but not the primary mineral for red blood cells.

Therefore, Iron is the correct answer as it is vital for healthy red blood cells and its deficiency directly causes anemia.