Foods To Increase Hemoglobin What is Hemoglobin (Hb)? Hemoglobin is a protein in red blood cells that transports oxygen from the lungs to the rest of the body and returns carbon dioxide back to the lungs. Why is it important to have a normal amount of hemoglobin? Maintaining optimum hemoglobin levels is crucial, as adequate hemoglobin levels ensure that tissues and organs receive the oxygen...