Find us on Social Media:

Fructo-oligosaccharides (FOS)
What is it? Overview Usage Side Effects and Warnings

Fructo-oligosaccharides (FOS) Side Effects and Warnings

Written by FoundHealth.

Safety Issues

FOS appear to be generally safe. However, they can cause bloating, flatulence, and intestinal discomfort, especially when taken at doses of 15 g or higher daily. 1 People with lactose intolerance may particularly suffer from these side effects. 2


  1. van Dokkum W, Wezendonk B, Srikumar TS, van den Heuvel EG. Effect of nondigestible oligosaccharides on large-bowel functions, blood lipid concentrations and glucose absorption in young healthy male subjects. Eur J Clin Nutr. 53(1):1-7.
  2. Teuri U, Vapaatalo H, Korpela R. Fructooligosaccharides and lactulose cause more symptoms in lactose maldigesters and subjects with pseudohypolactasia than in control lactose digesters. Am J Clin Nutr. 69(5):973-9.


No one has made any comments yet. Be the first!

Your Comment