No.1 brand fed in hospitals. Immune support. Brain development. Digestive health. Our closest formula to breast milk. 5 HMO prebiotics. HMOs are immune-nourishing prebiotics structurally identical to those in breast milk. No artificial growth hormones (No significant difference has been shown between milk derived from rbST-treated and non-rbST-treated cows). No palm olein oil. Breast milk is recommended. If you choose to use infant formula, the makers of Similac have a formula that's right for your baby.