PB Assist®+ Probiotic Defense Formula is a proprietary blend of pre-biotic fiber and six strains of probiotic microorganisms in a unique double-layer vegetable capsule delivering 5 billion CFUs of active probiotic cultures and soluble pre-biotic FOS (fructo-oligosaccharides) that encourages culture adhesion and growth. The time-release double-capsule delivery system protects sensitive probiotic cultures from stomach acid. PB Assist+ supports healthy digestive functions and immunities and is safe for use by all members of your family.