With Nature’s Way Fortify Optima, you’ll get 100 billion active probiotic cultures, specifically formulated to replenish your intestinal microflora during and after episodes of digestive distress or irregularity. In addition to relieving occasional gas, bloating and constipation, Fortify Optima promotes healthier digestion overall by releasing active probiotics directly into your intestine. The enteric coated vegetarian capsule helps ensure that the probiotics survive your stomach acid so that your intestinal tract receives the diversity of probiotics it needs. That includes 10 Unique Human Digestive Strains (HDS) – 6 Lactobacilli HDS for your small intestine and 4 Bifidobacterium HDS for your large intestine/colon. Using 100% HDS Probiotics, with no animal- or plant-sourced cultures, means Fortify Optima is naturally compatible with your intestinal tract.