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Probiotic functional foods are widely advertised to consumers primarily based on probiotic supplements.Determine if consumption of yogurt containing a high dose of probiotics improves health in children ages 1–3 years attending daycare/school centers.Double-blinded, randomized, placebo-controlled, allocation concealment clinical trial. Setting: Outpatient participants in the Washington, DC area. Participants: 182 healthy children between the age of 1 and 3 years attending daycare/ school at least 3 days a week. Intervention: Active was a strawberry yogurt-based drink supplemented with Bifidobacterium animalis ssp. lactis (B. lactis) BB-12. The placebo was indistinguishable from the active drink, differing only in absence of the probiotic BB-12. Primary objective was to determine if consumption of a probiotic-containing yogurt-based drink decreases absences due to illnesses from daycare for children ages 1–3 years. Secondary was to determine if probiotic-containing yogurt-based drink improves overall parental satisfaction due to decreased absences from work and an overall healthier child.There were no significant differences in the days of missed school per group, with 51.9% in the active group and 47.1% in the placebo group missing at least 1 day of school throughout the study. Additionally, there were no differences in any secondary outcomes among the groups.Consumption of a yogurt-based drink delivering 1010 CFU of Bifidobacterium animalis ssp. lactis (B. lactis) BB-12 per day did not decrease the number of days missed of school due to an illness. Additional independent research on the potential of BB-12 to reduce illness in children needs to be conducted.