In infants and children, iron deficiency impedes mental, motor, and auditory neuronal development leading to serious lifelong cognitive and physical deficiencies. In adults, iron deficiency, and associated iron deficiency anemia, cause extreme fatigue, decreased immune system function and increased susceptibility to infectious disease, reduced work capacity, dizziness, headaches, hair loss, and generalized reduced quality of life. Iron deficiency is also linked to Restless Leg Syndrome (RLS), adult hearing deficits, reduced strength, coordination, and endurance, anxiety, increased heart failure morbidity, decreased intellectual performance, and erectile dysfunction among many others conditions.