Here is more information: Superior, Triple Shell Protection Proprietary Blend Requires No Refrigeration. Advanced, Triple-Shell Technology. Easy-Swallow Bead. Most acidophilus products claim a high number of probiotics, but their capsules and tablets simply don't allow live cultures to survive the naturally acidic, harsh digestive environment.
But Natrol® BioBeads™ proprietary probiotic blend is uniquely protected, by an advanced triple shell that dissolves only upon reaching its destination. A billion probiotics guaranteed!
Outer Layer ensures shelf-stability. Middle Layer resists harsh stomach acid. Inner Layer dissolves in intestinal tract. No yeast, wheat, corn, milk, egg, soy, glutens, artificial colors or flavors, added sugar or preservatives.