Flora Kids Probiotic - Formerly Udo's Choice Super Children's Probiotic - Age Group 4 Years & Older - When the ratio of good bacteria to bad is out of balance, problems begin to arise such as poor absorption of nutrients and intestinal toxicity. Flora Kids Probiotic contains medicinal human strains of live probiotic bacteria that ensure better survival and colonization rates than transient strains. It's formulated with selective strains that survive the hydrochloric acid in the stomach, thus eliminating the need to use potentially allergenic enteric coatings.