Fiber
XOS (Xylooligosaccharides)
Also known as: Xylooligosaccharides
B
Evidence
Emerging prebiotic with benefits at very low doses. Well-tolerated with minimal GI effects.
Primary uses
- Prebiotic
- Gut health
- Low-dose option
How it works
- Effective at 1-2g doses
- Selectively feeds bifidobacteria
- Low fermentation rate - less gas
Dosage
- Typical range
- 1-2 g daily
- Timing
- Any time
- With food
- Optional
- Duration
- Safe long-term
- Special populations
- Those sensitive to other prebiotics
Forms
- Powder
- Capsules
Safety
Common side effects
- Minimal at recommended doses
Contraindications
- None
Evidence notes
Effective at low doses
Grade B: Some human trials support key claims; further confirmation needed.
Related in Fiber
Check a full stack
Formulate's free interaction checker lets you paste in any combination of supplements and medications at once — every pairing flags severity, timing, and cited evidence.
Open the checkerMedical disclaimer. This page is educational and does not replace advice from a qualified healthcare provider.