Swanson ProBiotic-4 is a broad spectrum probiotic delivering 3 billion CFU of beneficial bacteria from four select strains: Bifidobacterium lactis, Lactobacillus casei, Lactobacillus acidophilus and Bifidobacterium bifidum—all in convenient, easy-to-take vegan capsules. ProBiotic-4 supports bowel regularity and a healthy microbiome. Features prebiotic fructooligosaccharides to feed the probiotics.