Primadophilus Optima Digestive Balance is a shelf-stable probiotic formula designed to support digestive balance and immune health.* Multiple strains of Lactobacilli and Bifidobacteria including researched strains NCFM®, Bl-04® and Bi-07® to help fortify and balance intestinal microflora and support immune health* Delayed-release, vegetarian capsules Potency guaranteed through expiration date Shelf-stable, Once daily. Primadophilus Optima Digestive Balance contains 100% HDS Probiotics (human digestive strains). HDS Probiotics are probiotic strains that were originally isolated from the natural human intestinal microbiota as opposed to being isolated from animals, plants, dairy or soil sources. Today these strains are grown and fermented in a controlled environment by some of the most respected probiotic producers in the world. Targeted Release™ Made with delayed-release capsules that resist stomach acid better than standard capsules to help probiotics survive stomach acid so they are delivered to the intestine where they are needed most.