This probiotic superstar (voted a Best of Supplements winner by Better Nutrition magazine) is designed specifically with adults in mind. UP4 Adult is the perfect probiotic combination for helping adults maintain a healthy digestive system.* Starting with our own trademarked strain L. acidophilus DDS®-1, we added three strains of Bifidobacteria to maximize the benefits unique to each strain (B. longum, B. lactis, B. bifidum).