This advanced, dairy-free supplement from OptiBac contains 5 extensively researched strains, such as L. acidophilus NCFM® and B. bifidum Bb-02, in an extra strength dose of 20 billion live microorganisms per capsule, which includes 5 billion live cultures of Lactobacillus acidophilus NCFM®, thought to be the most researched strain of acidophilus in the world. The OptiBac strains in \'For Every Day Extra Strength\' (formerly known as \'For daily Wellbeing Extra Strength\') are some of the world\'s most researched and documented strains. All of the friendly bacteria in this supplement are scientifically proven to pass through stomach acidity to reach the gut alive. What\'s more, this natural supplement is free from sugars, fats and flavourings that may be found in other food & drinks containing live cultures. Suitable for vegetarians and vegans.