The primary function of iron in the body is to facilitate the transport of oxygen in the bloodstream. It is a critical component of hemoglobin, the protein in red blood cells that binds to oxygen and carries it from the lungs to tissues throughout the body. Adequate iron levels are essential for maintaining energy levels and overall health, as iron deficiency can lead to anemia, characterized by fatigue and weakness. Iron also plays a role in various metabolic processes, supporting overall bodily functions.