Each of the strains in this proprietary blend of 8 probiotic strains has been developed through decades of intensive scientific research. Each has been exposed to a variety of harsh conditions. As generations passed, the survivors of these conditions developed resistance to acidity, alkalinity, moisture, pressure and antibiotics. What does that mean to you? You are guaranteed an effective multi-level probiotic that survives long enough in your body to actually benefit your digestive and immune systems. In addition, a patented poly-matrix system guarantees that these shelf-stable vegetarian capsules retain their potency through the expiration date printed on the bottle. Why settle for a “hit or miss” probiotic blend, when you can put the power of these 8 hardy probiotic strains to work for you?