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. Each hemoglobin molecule can carry four oxygen molecules because of the iron it contains. This process is essential for keeping tissues and organs oxygenated and functioning properly. Why is it important to... https://www.freedomfromdiabetes.org/blog/post/foods-to-increase-hemoglobin/3999