OptiBac Probiotics Every Day Extra Strength is an advanced daily supplement which boosts a healthy digestive system and immune system. How does it work? Each capsule contains 20 billion live microorganisms, L. Acidophilus NCFM, and 14 other probiotic strains which are clinically proven help maintain a healthy digestive and immune system. These ingredients are scientifically proven to pass through the stomach acids and bile salts and reach the gut alive, where they can benefit the digestive process. Free from harmful ingredients. OptiBac Probiotics Every Day Extra Strength is free from sugars, fats, and flavourings.