Lactobacillus paracasei is a probiotic naturally found in the digestive tract as well as in fermented foods. L. paracasei is excellent at surviving the acidic stomach. We also love L. paracasei because it's bile resistant, meaning it can survive the bile acids found in the small intestines after eating. These features allow L. paracasei to stick around in the digestive system and give you powerful benefits all day long. L. paracasei has been studied for its potential to support a healthy immune system.