Supplement · Gut & digestive health
Prebiotic fibre (inulin & FOS)
Also known as: Inulin, FOS, Fructooligosaccharides
Soluble fibres that feed gut bacteria, with real but individual digestive effects.
- Evidence
- Silver· human data
- Sources cited
- 1
- Last reviewed
- 22 July 2026
Inulin and fructooligosaccharides (FOS) are soluble prebiotic fibres that pass to the colon and feed beneficial bacteria, which ferment them into short-chain fatty acids.
There is reasonable evidence they can shift the gut microbiome and modestly support regularity and mineral absorption, with weaker signals for metabolic markers. The trade-off is very individual: in sensitive people (and those with IBS) they readily cause gas and bloating, so start low.