Optibac probiotics one week flat is a unique blend of 4 strains of live cultures which have different properties and are all scientifically proven to survive the stomach acidity and bile salts to reach the gut alive having an imbalance of good and bad bacteria in the gut may be associated with various digestive health conditions such as bloating this carefully selected formula is guaranteed to provide a daily dose of 5 billion live cultures such as lactobacillus acidophilus rosell 52 and