Powder milk-based. For breastfeeding moms who choose to introduce formula. No. 1 brand fed in hospitals. No artificial growth hormones (No significant difference has been shown between milk derived from rbST-treated and non-rbST-treated cows). OptiGro: DHA: Brain nourishing. Lutein: Eye health. Vitamin E: Growth & development. Breast milk is recommended. If you choose to use infant formula, the makers of Similac have a formula that's right for your baby. Our feeding expert hotline is available to help you with feeding questions: 800-986-8800. Have product-related questions? Call 1-800-515-7677, 8:30 am-5:00 pm, Eastern time, weekdays. www.Similac.com. Gluten free. Galacto-oligosaccharides are prebiotics sourced from milk (GOS). C. Cohnii oil is a source of DHA. M. Alpina oil is a source of ARA.