Probiotics like Bacillus coagulans populate the Gi tract by the trillions, where they may help digestion, free up valuable nutrients, support normal immunity, and help support proper intestinal pH balance. Inulin is a type of fiber that acts as a prebiotic, which means it provides important nutrition to the probiotics and helps them prosper. And so, probiotics and prebiotics together in one supplement may provide a more favorable environment for gut health than either of them do individually. For that reason, the combination of probiotics and prebiotics are often used together to boost immunity. The Bacillus coagulans strain of probiotics found in Mason Natural is also especially tough. Meaning, it s more resistant to heat, stomach acid and moisture than many other species, which makes it ideal for dietary supplements.