What is the primary function of iron in the human body?

The primary function of iron in the human body is oxygen transport in red blood cells. Iron is a crucial component of hemoglobin, the protein in red blood cells that binds to oxygen in the lungs and carries it to tissues and organs throughout the body. This process is vital for cellular respiration, allowing cells to produce energy. Without adequate iron, the body cannot produce enough healthy red blood cells, leading to conditions like anemia, which can result in fatigue, weakness, and other health issues.

While hormonal balance, bone density, and energy production are also important aspects of health, they are not the primary roles associated with iron. Hormonal balance involves various nutrients and factors beyond iron, bone density is largely supported by calcium and vitamin D, and while iron is essential for energy metabolism, its most recognized and critical role remains in facilitating oxygen transport.