At a glance
How does Guar gum and xanthan gum appear on a UK label?
Useful label-reading detail
Do not merge the two: E412 is guar gum and E415 is xanthan gum. A label usually does not give grams.
How it is classified
Hydrocolloid thickeners and possible NOVA formulation markers. Guar is fermentable; neither name alone supplies a universal FODMAP verdict.
Why amount matters
Tolerance depends on the gum, amount, adaptation and rest of the product.
Evidence by study type
What do studies show about Guar gum and xanthan gum?
What was studied: In a single-arm, open-label proof-of-concept study, 12 healthy men consumed 8 g/day guar gum for 18 days, with transient gas and partial adaptation. Xanthan gum was assessed separately in regulatory human and toxicology evidence.
What it cannot tell us: A small uncontrolled study cannot show that time-related change was caused by adaptation, and specialised preparations do not represent every food.
Sources2023 guar-gum human studyEFSA guar-gum assessmentEFSA xanthan-gum assessment
What human studies show about Guar gum and xanthan gum
A 12-person guar-gum study using 8 g/day found a temporary rise in gas and digestive sensations followed by adaptation. Xanthan evidence at food exposure is limited; EFSA reported high tested intakes were generally tolerated, with discomfort in some people.
SourcesUK approved-additives listGreat Britain food-additive register2023 guar-gum human studyEFSA guar-gum assessmentEFSA xanthan-gum assessment
What animal or laboratory studies suggest about Guar gum and xanthan gum
Specialised animal findings cannot be transferred to every gum-containing food. Guar fermentation and xanthan degradation follow different microbial pathways.
SourcesUK approved-additives listGreat Britain food-additive register2023 guar-gum human studyEFSA guar-gum assessmentEFSA xanthan-gum assessment
What we still do not know about Guar gum and xanthan gum
Exact amounts in foods and which formulations matter to a particular person remain unknown.
Great Britain regulatory context
E412 and E415 are authorised in Great Britain. EFSA concluded that neither guar nor xanthan required a numerical acceptable daily intake and found no general-population safety concern at assessed food-additive exposures.
SourcesUK approved-additives listGreat Britain food-additive register2023 guar-gum human studyEFSA guar-gum assessmentEFSA xanthan-gum assessment
Common questions
Questions people ask about this label
Are guar gum and xanthan gum the same?
No. Guar gum is a plant-derived galactomannan labelled E412; xanthan gum is produced by microbial fermentation and labelled E415. They share jobs in food, not identity or evidence.
SourcesUK approved-additives listEFSA xanthan-gum assessment
Which gum is fermentable?
Guar gum is readily fermented and can temporarily increase gas. EFSA also expects xanthan gum to be fermented by intestinal microbiota, but its behaviour and evidence should not be inferred from guar.
Why are these gums common in gluten-free bread?
They hold water and help create viscosity and structure that gluten would otherwise contribute. That technical function is separate from a personal tolerance question.
SourcesUK approved-additives list
References
Sources used for this page
- Food Standards Agency, Approved additives and E numbers
- Food Standards Agency, Register of food-additive authorisations for Great Britain
- Barber et al. (2023), Metabolic response of intestinal microbiota to guar gum consumption
- EFSA ANS Panel (2017), Re-evaluation of guar gum (E412)
- EFSA ANS Panel (2017), Re-evaluation of xanthan gum (E415)
Written and evidence-checked by the GutGuard editorial team. We favour official UK guidance, systematic reviews and primary human research, and label animal, laboratory and exploratory findings clearly. Read our editorial method.