21st Century® Advanced Probiotic Supplement combines six genetically distinct, synergistically beneficial probiotic strains to support digestive health and the immune system. Each capsule contains 20 billion live probiotic cultures, including Lactobacillus acidophilus, Lactobacillus casei, Lactobacillus rhamnosus, Bifidobacterium longum, Bifidobacterium lactis, and Lactobacillus delbrueckii. Probiotics are live microorganisms that, when consumed in adequate amounts, provide various health benefits by promoting "good" bacteria in the gut. This gluten-free gut health supplement offers 24/7 digestive support, helping to maintain healthy intestinal activity.