OptiBac Live Cultures 'For every day EXTRA Strength' is especially for those seeking a high strength, daily supplement of natural bacteria. It contains the strain Lactobacillus acidophilus NCFM; thought to be the most researched strain of acidophilus in the world. All 4 strains are scientifically proven to reach the gut alive. Suggested for daily use, each capsule provides 20 billion live microorganisms guaranteed until end of expiry. OptiBac Live Cultures 'For every day EXTRA Strength' is suitable for pregnant and breastfeeding women, for vegans & vegetarians, and is also gluten free. Each pack contains 90 capsules. Unlike many products containing live cultures, this supplement does not require refrigeration. All OptiBac Live Cultures strains are thoroughly researched and documented, so you can be confident you're getting a high quality supplement that's right for you.