FSC Acidophilus Bifidus FOS helps maintain a healthy digestive system & supports the immune stsyem. Great for travellers experiencing different food & water in unfamiliar places. FSC Acidophilus Bifidus FOS helps maintain a healthy digestive system & supports the immune stsyem. Great for travellers experiencing different food & water in unfamiliar places. Acidophilus & Bifidobacterium are beneficial in supporting the bacteria found in the digestive tract. Adequate quantities of these bacteria are needed to keep a health balance of the gut flora & a probiotic supplement may play a role in maintaining good digestion. Acidophilus inhibits the growth of disease-causing bacteria such as E coli & salmonella. Fructooligosaccharides (FOS), naturally occurring carbohydrates, supports the growth of bifidobacterium.