The delicate balance of our intestinal flora (friendly bacteria) can be disturbed for example, by todays demanding lifestyle, changes in dietary habits, ageing, pain killers & antibiotics. Friendly bacteria play a key role in digestion. & more than 80% of our immune system is dependent on our intestinal health. So maintaining healthy intestinal flora is essential for optimal health. This high potency, well-researched, special strain friendly bacteria (probiotic) is specifically designed for use during & after antibiotics, to help maintain a healthy gut flora, & to support digestive & immune system health. Each of the four strains, Lactobacillus acidophilus, Lactobacillus casei, Bifidobacterium lactis (formerly known as Bifidobacterium longum) & Bifidobacterium bifidum, have been chosen to act synergistically for greater effect. The formula is highly stable, as it is resistant to stomach acid & bile salts, which means that the bacteria reach the colon alive. Refrigerate before & after opening. Three capsules supply 9 billion viable organisms. Tests show that more is not necessary.