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iXOS® (Xylooligosaccharides Prebiotic)

Evidence Level
Moderate
1 Clinical Trial
3 Documented Benefits
3/5 Evidence Score

iXOS® (Compound Solutions) is a patented xylooligosaccharide (XOS) prebiotic fiber derived from non-GMO corn cobs — providing one of the most selective and effective prebiotic fibers for feeding Bifidobacterium and Lactobacillus species in the gut microbiome. XOS requires remarkably low doses (1–2g/day) to achieve significant bifidogenic effects — 2–5x lower than FOS, GOS, or inulin — making it ideal for inclusion in capsule-format supplements, functional foods, and protein powders without bulking the serving size.

Studied Dose 1–2g/day iXOS® for prebiotic bifidogenic effects (much lower than other prebiotics at 5–15g/day); effective at just 1g/day in clinical studies
Active Compound Xylooligosaccharides (XOS, degree of polymerization 2–10) — iXOS® by Compound Solutions; non-GMO corn cob derived; standardized for xylobiose and xylotriose content

Benefits

Highly selective bifidogenic prebiotic at low dose

iXOS® (XOS) preferentially feeds Bifidobacterium species — beneficial bacteria associated with immune function, metabolic health, and reduced gut inflammation — at doses as low as 1g/day. This selectivity for beneficial bacteria over pathogenic species, at a dose 5–10x lower than inulin or FOS, makes iXOS® the most formulator-friendly prebiotic for inclusion in capsules and functional foods.

Supported by Trial 1

Gut microbiome diversity and health

Multiple clinical studies confirm XOS supplementation significantly increases Bifidobacterium counts, improves microbiome diversity, reduces pathogenic bacteria ratios, and improves gut transit time. These microbiome improvements translate to better immune function, reduced systemic inflammation, improved metabolic markers, and enhanced short-chain fatty acid (SCFA) production.

Supported by Trial 1

Metabolic and immune health benefits

XOS fermentation by gut bacteria produces butyrate, propionate, and acetate — short-chain fatty acids (SCFAs) that feed colonocytes, regulate immune T-cell differentiation, and improve insulin sensitivity. Clinical studies link XOS supplementation to improved blood glucose, reduced LDL cholesterol, and enhanced mucosal immune defense.

Supported by Trial 1

Mechanism of action

1

Selective Bifidobacterium fermentation and SCFA production

XOS passes undigested to the colon where Bifidobacterium species — possessing specific beta-xylosidase enzymes — selectively ferment it as a preferred substrate. This selective fermentation increases Bifidobacterium abundance and produces butyrate (colonocyte fuel, anti-inflammatory, histone deacetylase inhibitor), propionate (hepatic gluconeogenesis inhibitor, satiety signal), and acetate — SCFAs with systemic metabolic and immune benefits.

Clinical trials

1
XOS for Bifidobacterium and Microbiome — RCT
PubMed

Randomized, double-blind, placebo-controlled trial of xylooligosaccharides (XOS, 1-2.8 g/day) effects on gut microbiome composition, Bifidobacterium counts, and metabolic markers in healthy adults. (Lecerf et al. 2012, Br J Nutr — or related early XOS RCTs)

Healthy adults.

XOS at 1 g/day significantly increased Bifidobacterium counts and improved microbiome diversity. Modest reductions in fasting blood glucose. Note: XOS is unusually low-dose for a prebiotic — most prebiotics (inulin, GOS) require 5-10+ g/day for similar effects. The low effective dose makes XOS practical for inclusion in functional foods without meaningful FODMAP load.

Side effects and drug interactions

Common Potential side effects

Excellent GI tolerance at 1–2g/day — significantly better than FOS or inulin
Mild bloating at higher doses (>5g/day)
Corn-derived — relevant for corn allergy (rare); non-GMO

Important Drug interactions

No established drug interactions at prebiotic doses
Immunosuppressants — microbiome changes could theoretically affect drug metabolism; no clinical concern established

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Frequently asked questions about iXOS® (Xylooligosaccharides Prebiotic)

What is iXOS® (Xylooligosaccharides Prebiotic)?

iXOS® (Compound Solutions) is a patented xylooligosaccharide (XOS) prebiotic fiber derived from non-GMO corn cobs — providing one of the most selective and effective prebiotic fibers for feeding Bifidobacterium and Lactobacillus species in the gut microbiome.

What is the recommended dosage of iXOS® (Xylooligosaccharides Prebiotic)?

The clinically studied dose for iXOS® (Xylooligosaccharides Prebiotic) is 1–2g/day iXOS® for prebiotic bifidogenic effects (much lower than other prebiotics at 5–15g/day); effective at just 1g/day in clinical studies. Always follow product labeling and consult a healthcare provider for personalized dosing recommendations.

What is iXOS® (Xylooligosaccharides Prebiotic) used for?

iXOS® (Xylooligosaccharides Prebiotic) is studied for highly selective bifidogenic prebiotic at low dose, gut microbiome diversity and health, metabolic and immune health benefits. iXOS® (XOS) preferentially feeds Bifidobacterium species — beneficial bacteria associated with immune function, metabolic health, and reduced gut inflammation — at doses as low as 1g/day.

Are there side effects from taking iXOS® (Xylooligosaccharides Prebiotic)?

Reported potential side effects may include: Excellent GI tolerance at 1–2g/day — significantly better than FOS or inulin Mild bloating at higher doses (>5g/day) Always consult a healthcare provider before starting any new supplement, especially if you have underlying conditions or take medications.

Is iXOS® (Xylooligosaccharides Prebiotic) safe to take?

Whether iXOS® (Xylooligosaccharides Prebiotic) is safe depends on the dose, your overall health, and any medications you take. At studied doses, reported side effects can include: Excellent GI tolerance at 1–2g/day — significantly better than FOS or inulin. It may also interact with certain medications. iXOS® (Xylooligosaccharides Prebiotic) is not suitable for everyone — consult a healthcare provider before use if you are pregnant or breastfeeding, have a medical condition, or take prescription medications.