Nature's bounty advanced probiotic 10 contains 10 distinct naturally derived probiotic strains. These strains play an active role in aiding the body's natural digestive process. Advanced probiotic 10 also contains 20 billion live probiotic cultures per serving. Probiotics not only support microbial balance of healthy intestinal flora, but assist in the body's natural digestive process, and contribute to immune function. Probiotics help support the absorption of nutrients.