Similac Alimentum Infant Formula with Iron is a nutritionally complete, hypoallergenic formula for infants with severe food allergies, including those with colic symptoms due to protein sensitivity; it starts reducing excessive crying due to cow's milk protein sensitivity in most infants within 24 hours. This unique formula contains a predigested milk protein that is broken down into tiny pieces to virtually eliminate allergic reactions in most babies who are allergic to cow's milk protein, and it includes DHA (docosahexaenoic acid) and ARA, special nutrients found in breast milk that are important for helping support brain and eye development as well as a blend of carbohydrates using two different absorptive pathways to help maximize absorption and minimize malabsorption risks; plus, this formula is made with oils that have been shown to be well absorbed; approximately 33% of the fat as medium-chain triglycerides (MCT).