Preferred Nutrition Probiotic 30 Billion - Probiotic 30 Billion features eight strains of probiotic bacteria to help support gastrointestinal health. Bifidobacteria and lactobacilli probiotic strains are combined at clinically studied strengths to restore and normalize intestinal flora. Each daily vegetarian capsule is guaranteed to contain 30 billion active cells, delivered as microencapsulated beadlets.