Pure Encapsulations Probiotic-5 is a high-strength blend of lactobacilli and bifidobacteria to promote GI tract health and comfort, immune cell function and overall health. Each capsule of Probiotic-5 provides 10 billion CFU of the beneficial bacteria Lactobacillus acidophilus, Lactobacillus rhamnosus, Bifidobacterium longum, Bifidobacterium bifidum and Bifidobacterium lactis. L. acidophilus and B. longum have been shown to promote healthy cytokine production in the colon and maintain healthy GI barrier function, in part by supporting the mucosal lining of the GI tract. Several trials have also revealed that mixed probiotic supplementation helps maintain intestinal flora, support healthy yeast balance, and promote GI comfort. A study involving elderly individuals indicated that a mixture of lactobacilli and bifidobacteria maintained healthy gut ecology.