Natural Factors Double Strength Ultimate Multi Probiotic - 24 billion active cells - A high-potency probiotic formula provides friendly bacteria to support the health of the digestive and genitourinary tracts, a normal immune system, and the gut-brain connection. Ideal for restoring intestinal balance, especially if upset by antibiotic use, poor diet, or stress. Every capsule provides eight strains of lactobacilli for small intestine support and four strains of bifidobacteria for large intestine (colon) support, alongside prebiotics for further support of beneficial bacterial populations. These probiotic strains are carefully selected from human, plant, and dairy sources for their ability to resist gastric acid as well as for optimal absorption and effectiveness. This one-per-day formula provides an easy and convenient way to help restore and maintain a harmonious balance of beneficial bacteria in the gut by inhibiting the colonization and growth of pathogenic organisms that can lead to diarrhea, constipation, bloating, gas, and cramps.