Natural Factors Double Strength Ultimate Multi Probiotic is a one-per-day 12-strain formula featuring a guaranteed total of 24 billion colony forming units at expiry to comprehensively support gastrointestinal health. Each vegetarian capsule provides eight lactobacilli strains and four bifidobacteria strains from human (8), plant (1), and dairy (3) sources, to support the small and large intestines, the gut-brain axis, and overall health.