What is iron primarily responsible for?

• A. Oxygen delivery
• B. Immune function
• C. Enzyme cofactor
• D. Blood glucose transport

Answer: (A)

Iron’s essential job in the body is to help deliver oxygen to tissues, through its role in hemoglobin. The iron in the heme group of hemoglobin binds oxygen in the lungs and carries it to cells throughout the body, where it is released for use in energy production and metabolism. This oxygen-delivery function is what makes iron so critical for overall performance and endurance. While iron also serves as a cofactor for many enzymes and supports immune function, these roles are secondary to its primary job of enabling oxygen transport. It’s not involved in blood glucose transport.