OptiBac Probiotics \'One week flat\' has been created especially for those wishing to take a short-term course of live cultures. It contains high quality researched strains such as Lactobacillus casei Rosell-215 and is advised to be taken consecutively for seven days. Each sachet provides 5 billion live microorganisms that will survive through stomach acidity and are guaranteed until end of expiry. \'One week flat\' is gluten-free and therefore may be suitable for those with bloating.