Similac Alimentum infant formula with 2'-FL HMO is the first and only hypoallergenic infant formula with 2'-FL HMO, a unique immune-nourishing ingredient. It starts reducing colic symptoms due to protein sensitivity in most babies within 24 hours,* so your baby can start feeling better today.* * Based on a clinical study with Alimentum Ready to Feed without DHA, ARA, 2'-FL HMO, lutein, and beta-carotene. A crossover clinical study of infants experiencing colic symptoms due to cow's milk protein sensitivity showed 5 of 6 infants initiated on Alimentum during the first week achieved a reduction in excessive crying. Data on File, Study AC84, August 2004. Abbott Nutrition, Columbus, Ohio.