OptiBac Probiotics 'For every day MAX' has been created especially for those seeking a high strength, high quality option for their daily supplement of natural bacteria. This premium option contains 3 of the most clinically trialled strains of live bacteria in the world: Lactobacillus acidophilus NCFM®, Bifidobacterium lactis HN019 & Bifidobacterium lactis BI-04. Lactobacillus acidophilus NCFM® is thought to be most researched strain of acidophilus in the world. Suggested for daily use, each capsule provides 50 billion live microorganisms guaranteed until end of expiry.