Lactobacillus paracasei is a type of probiotic bacteria that is commonly found in dairy products such as yogurt and kefir. This beneficial bacterium is known for its ability to promote digestive health, boost the immune system, and inhibit the growth of harmful bacteria in the gut. In addition to Lactobacillus paracasei, there are several other synonyms and common names for this microorganism, including L. casei, L. rhamnosus, and Lactobacillus acidophilus. These different names may refer to slightly different strains or subspecies of the same bacteria, but all share the same basic health benefits and are widely used in probiotic supplements and dairy products around the world.