Solgar - Gentle Iron Non-Constipating - 90 Vegetarian Capsules Iron is an important component of hemoglobin, the protein that carries oxygen from the lungs to all tissues of the body and promotes iron rich blood. Iron promotes normal red blood cell production and supports energy utilization. This formulation provides an advanced, patented form of iron which is non-constipating and gentle on the stomach. Solgar Gentle Iron Non-Constipating Contains: No Gluten No Wheat No Dairy No Soy