ingredient page

Inulin, FOS and GOS: benefits, differences and bloating.

Inulin, FOS and GOS are popular prebiotic fibres. Their strength is fermentability, but that same feature can cause gas when introduced too quickly.

By Fybrance Editorial Updated 15 Jul 2026 production ready

Inulin, FOS and GOS are popular prebiotic fibres. Their strength is fermentability, but that same feature can cause gas when introduced too quickly.

These fibres are useful to understand because they are common in gut-health products and because tolerance varies strongly by dose and speed.

Key takeaways

  • They are prebiotic fibres, not probiotics.
  • Fast fermentation can be useful and uncomfortable.
  • Start gradually and compare tolerance honestly.

Why they can cause gas

Gas is often a sign of fermentation, not automatically harm. But too much too soon can make a useful fibre feel unsuitable.