Over 100 trillion bacteria make up the human microbiome in your digestive system. This delicate ecosystem can be disturbed by many things including illness, antibiotics and poor diet. Probio7 Original contains live bacteria to complement the gut flora naturally present in your digestive system. Each capsule contains 4 billion friendly bacteria from 7 strains including L. acidophilus, plus 2 types of natural fibre which feed and encourage friendly bacteria in your digestive system.