Xanthan gum
A ferment-derived polysaccharide used at very low levels to thicken, stabilize, and suspend ingredients; it creates smooth, pourable textures that ‘thin when shaken’ and re-thicken at rest.
Should I eat Xanthan gum?
Xanthan gum is a refined, fermentation‑derived additive used in tiny amounts and judged safe at typical food levels. Avoid xanthan‑based thickener products for premature infants; if thickened drinks leave you bloated, choose options with less gum or different thickeners.
Summary
Xanthan gum is made when bacteria ferment plant sugars, then the gum is precipitated with alcohol, washed, and milled to a powder. Major safety reviews (EFSA and JECFA) found no genotoxic or cancer concerns and set no numerical ADI for general use. Foods usually contain only 0.05–0.5%, so calorie impact is negligible, but very high supplemental intakes can cause gas or loose stools. Some people’s gut microbes can digest xanthan, which may change how it ferments; the health meaning of this is still uncertain. Separate from everyday foods, xanthan‑based thickener products have been associated with NEC in premature infants, so they should not be used in that group.
Key Research Points
Preterm infants: do not use
Xanthan‑based thickener products have been linked to necrotizing enterocolitis, a serious bowel disease, in premature infants. If caring for a preemie, avoid xanthan thickeners and follow clinical guidance.
High doses can upset digestion
Short trials found adults tolerated about 15 g/day for 10 days, but some had gas, bloating, or loose stools. Everyday foods use far less (about 0.05–0.5%), so issues are more likely if you rely on many thickened drinks or supplements.
Your microbiome may adapt
Many people carry gut bacteria that digest xanthan, which can change fermentation by‑products and how you feel after eating it. The long‑term health impact of this adaptation is not yet known.
Overview
What is it?
Why is it used?
Origin
Xanthan gum was first identified by USDA researchers in the early 1960s while screening microbes for useful polysaccharides. A plant-pathogenic bacterium, Xanthomonas campestris, produced an unusually efficient thickener during sugar fermentation. By the late 1960s it entered commercial production and quickly became a staple in salad dressings and sauces because a tiny amount could keep oil and spices evenly dispersed while remaining easy to pour. Its popularity later expanded to gluten-free baking and medical-nutrition thickeners for people with swallowing difficulties.
Process: Aerobic fermentation, alcohol precipitation, dry & mill
Steps
Chemicals
Research & Safety
Potential Concerns
The clearest caution is for premature infants: xanthan‑based thickeners have been associated with NEC in case reports, and FDA has warned against their use in preemies; families should follow clinician guidance. In adults and older children, typical food levels are very low, but high supplemental intakes can cause gas, bloating, or loose stools; reduce the dose or split intake if sensitive. Modern data show some people’s gut bacteria readily digest xanthan, which may shift the microbiome; whether this is helpful, neutral, or harmful remains uncertain. EFSA also reviewed potential impurities (e.g., lead, arsenic) and supported tighter specifications; food‑grade xanthan is regulated with identity and solvent limits to manage such risks.
Potential Benefits
No demonstrated nutrimental benefit.
Digestive Effects
At normal recipe levels (about 0.05–0.5%), most people notice no digestive effects. At gram‑level intakes used in some supplements or thickener products, some report bloating, gas, or looser stools. Controlled studies in adults tolerated about 15 g/day for 10 days with some abdominal discomfort in a subset; lowering the amount usually resolves symptoms. Because gut microbiomes differ, tolerance varies—people with irritable bowel symptoms or active GI disease may be more sensitive.
Limit Consumption
Premature infants should not receive xanthan‑based thickening products because of NEC case reports and FDA warnings. For infants below 16 weeks using special medical formulas, EFSA (2023) concluded that up to 1,200 mg/L in formula did not raise concerns when considering a conservative animal NOAEL, but emphasized limited infant clinical data. Adults and older children generally tolerate typical food amounts, though individuals with active GI disease may prefer to limit intake. People with severe difficulty swallowing should only use xanthan‑based thickeners under clinician direction.
Fact Sheet
Regulatory Status
ESG & Sustainability
Allergens and Diet
Natural Alternatives
Psyllium husk
Guar gum
Agar
Citations
Re-evaluation of xanthan gum (E 415) as a food additive
2017-07-14Mortensen A., Aguilar F., Crebelli R., et al. • EFSA Journal
xanthan gum (INS 415) – ADI not specified; neonatal pig NOAEL 750 mg/kg bw/day
1986-01-01FAO/WHO JECFA • JECFA Database (FAO/WHO)
Manufacturing Process Change on the Safety and Regulatory Status of a Food Substance (xanthan gum references 21 CFR 172.695; GRN 000121)
2014-06-04U.S. FDA • FDA Guidance (Appendix case studies)
Xanthan Gum – Handling/Processing
2016-04-22USDA AMS • USDA AMS Technical Evaluation
Feed thickeners and NEC: too risky to chance
2012-06-14Clarke P. • Journal of Perinatology (letter)
Re-evaluation note referencing 2017 assessment
2023-05-04EFSA Panel • EFSA Journal (update note)
Xanthan Gum – Specifications & production summary
2002-01-01FAO • FAO Knowledge Repository
Xanthan gum on the National List (§205.605(b))
2022-12-02USDA AMS NOP • USDA NOP
Re-evaluation of xanthan gum (E 415) as a food additive (PMC)
2017-07-14Mortensen A., et al. • EFSA Journal (open-access copy)
Widespread consumption of xanthan gum is coupled to specific gut microbial degraders
2022-02-01Ostrowski M.P., et al. • Applied & Environmental Microbiology / PNAS cluster (microbiome)