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. Due to protein sensitivity. 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 cows 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.