Mercury & Iron Absorption Mercury, Iron Receptors, and the Illusion of Iron Deficiency Iron deficiency is one of the most common explanations given for fatigue, hair loss, shortness of breath, poor immunity, and low stamina. Yet for many people, iron supplementation brings little improvement—or makes symptoms worse. In these cases, the issue is often not how much iron is consumed , but how much iron the body can actually absorb and utilize at the cellular level . Mercury’s I