Primadophilus Original Ensures 5 billion CFUs per capsule 2 strain lactobacillus formula (rhamnosus & acidophilus) specifically designed to meet the needs for ages 12 & upThe True Guarantee of PrimadophilusThe Primadophilus brand is backed by an unparalleled True Guarantee that ensures consistent purity, potency and intestinal delivery. This 3 part guarantee includes: True Potency The potency of CFUs claimed on the label is fully guaranteed until expiration, not just at time of manufacture True Release Delayed release ensures stomach acid survival and intestinal delivery True Identity Only the probiotic strains listed on the label make their way into a Primadophilus product