Optibac probiotics amplsquoone week flatamprsquo formerly known as amplsquofor a flat stomachamprsquo is ideal for those wanting a shorter course of live culturesampnbsp this 7 day course contains 4 high quality strains of natural bacteria all with different properties and scientifically proven to reach the gut aliveampnbspoptibac 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