Guaranteed 2 Billion Live Cultures Digestive Health Helps Maintain a Healthy Digestive Tract Strengthens the Body's Natural Immunity Helps Ease Occasional Stomach Discomfort Dietary Supplement ‡At time of manufacturer Superior Triple-Shell Protection Natrol Probiotic Acidophilus BioBeads are uniquely protected by an advanced triple shell that ensures probiotic viability. First Layer: Targeted-release technology helps guarantee BioBeads potency on the shelf, and protects viable microflora all the way to ingestion. Second Layer: Bead passes safely through the acidic stomach environment unharmed. Third Layer: Inner layer gently breaks down in the small intestine, releasing proprietary blend of probiotics that helps support digestive health and immunity.