There are three distinguishing characteristics about Dr. Tennant's Probiotic Formula: Prebiotics (most probiotics don't have), Probiotics (clinically studied & well-known), and DRCaps (time-released delivery system allowing them to resist stomach acid). Dr. Tennant's Probiotic Formula is a powerful synbiotic formula. Yes, you read that correctly – synbiotic (not symbiotic) formula. A synbiotic formula is a formula that combines probiotics and prebiotics. Because they work so much better together – a form of synergy – the term synbiotic is used to describe this biological synergy that can help support a healthier GI system. As you would expect, Dr. Tennant's Probiotic formula takes synbiotic complementary medicine to the next level. Did you know that probiotics in most supplements do not survive stomach acid, or that exposure to any moisture “wakes up” probiotics and brings them out of their state of suspended animation? Exposure to moisture can occur while they are in a bottle on a shelf or after the bottle has been opened. In a few short days, they are no longer viable. Dr. Tennant's Probiotic Formula utilizes specialized delivery technology designed to keep probiotics alive and deliver them unharmed through stomach acid into the intestines, where they can colonize and provide health and wellness support. Capsugel DRcaps is a special vegetarian capsule technology that is proven to protect capsule contents through harmful stomach acid. Stomach acid can't touch the selected probiotic strains in Dr. Tennant's Probiotic. The formula features 11 of the most helpful probiotic strains that support human health. Prebiotics support probiotics and make a significant contribution to the viability of healthy probiotic strains. Prebiotics are basically food for probiotics. Taking prebiotics helps probiotics work more efficiently and stimulates the growth of existing beneficial bacteria in the GI tract.