Similac Pro-Advance Organic 1.45 lb. Powder, Unflavored, 3,358 Calories Per Can. Similac Pro-Advance also has OptiGRO, our unique blend of DHA, Lutein, and Vitamin E, to help support your babys overall growth, and brain and eye development. Trust Similac Pro-Advance to provide a strong start for your babys developing immune system.