Probiotics are defined as microorganisms that provide benefits to their host. Humans rely on resident microorganisms, including probiotics, to keep our bodies healthy and functioning properly, but diet and other factors can alter our healthy bacteria. Probiotics for Overall Gut Health Research strongly supports the benefits of probiotics for the digestive system, including evidence that these healthy bacteria improve symptoms associated with several intestinal conditions. Immune Support While we think of our digestive system mainly for its role in processing food and getting us the nutrients that we need, it is also one of the most active components of our immune system. Data suggest that probiotic bacteria directly and indirectly enhance a protective immune response. Nutrient Absorption Probiotics have also been shown to have an important impact on the absorption, use, and storage of energy from the food we consume, including the generation of beneficial short-chain fatty acids that promote weight regulation. Surviving the Stomach: The Probiotic Journey Since probiotics must make it through the stomach to be effective, the beneficial properties of a probiotic product depend on its survival in a harsh, acidic environment. Physician's Choice delayed-release capsules are acid-resistant, offering a critical layer of protection to keep the probiotic organisms viable on their journey to the intestines.