Gluten-Free, Non-Sterile Abbott Similac Advance® Infant Formula with Iron is a milk-based, iron-fortified infant formula with special nutrients found in breast milk. This formula comes with docosahexaenoic acid (DHA) and arachidonic acid (ARA) for use as a supplement to breastfeeding. The formula with patented blend of special breast milk nutrients called nucleotides, helps to develop immune system in infants.