Similac for Supplementation is the first Similac formula designed for breastfeeding moms who choose to introduce formula. This formula has more prebiotics than any other Similac formula, along with the same benefits as Similac Advance, so it provides complete nutrition and a gentle introduction to formula. Provides Complete Nutrition and a Gentle Introduction to Formula. Similac is the first leading infant formula brand with no artificial growth hormone† (†no significant difference has been shown between milk derived from rbST-treated and non-rbST-treated cows) For breastfeeding moms who choose to introduce formula Helps provide a gentle introduction to formula Has vitamins, minerals, and other nutrients that can be found in breast milk, and has prebiotics Features OptiGRO, an exclusive blend of important ingredients found in breast milk: DHA, Lutein, and Vitamin E Generations of moms have put their trust in Similac