Hemoglobin, which is the protein within red blood cells that transports oxygen, requires iron to develop and function. Without an ample supply of oxygen, our body’s cells become impaired within moments and no longer have the energy to carry out the vital processes of life. Iron also helps to support amino acid metabolism and synthesis, all of which help support muscle and cognitive function. A deficiency in iron might possibly cause symptoms such as fatigue, weakness, shortness of breath, headaches, dizziness and lightheadedness. Iron deficiency is one of the most common nutrient deficiencies worldwide. It most often affects pregnant women, infants and young children, women with heavy menstrual bleeding, and frequent blood donors.