GI Balance Pro supports digestive health, regularity, a healthy immune system, and microbial balance in times of stress or after antibiotic therapy for cats and dogs. This chew features 1 billion CFU of a patented version of a specialized lactic acid bacterial strain Bacillus coagulans, called GanedenBC30®. It has been extensively studied for stability, survivability and safety. The non-soluble fiber prebiotic FOS supports the preparation of the gut for colonization and supports regularity. 0-30 lbs: 1 chew daily 31-60 lbs: 2 chews daily 61+ lbs: 3 chews dailyVetriScience Laboratories