Multi-Probiotic 40 Billion contains 16 beneficial strains of Lactobacillus, Lactococus, Bifidobacterium and Streptococcus cultures, including the clinically researched Bifidobacterium lactis HN019 that supports gastrointestinal and immune function. Also included in the synbiotic blend is a Nutraflora short-chain FOS prebiotic fiber, which is well tolerated and works synergistically with probiotics to flourish in the intestinal tract. These probiotics are resistant to both acid and bile and undergo a patented cryoprotectant stabilization process for shelf stability.