What Is Xanthan Gum? Uses, Safety & Formulation Guide

Xanthan gum is a high-molecular-weight exopolysaccharide produced through the aerobic fermentation of simple sugars by the bacterium Xanthomonas campestris. First developed in the early 1960s through the U.S. Department of Agriculture’s Northern Regional Research Laboratory program, xanthan gum entered commercial production shortly thereafter and has since become one of the most widely used hydrocolloids in food, personal care, pharmaceutical, and industrial formulations worldwide.

How the molecular structure of xanthan gum determines its performance

At the molecular level, xanthan gum consists of a cellulose-like backbone of β-(1→4)-linked D-glucose units, with trisaccharide side chains attached to every other glucose residue in the main chain. Each side chain contains a mannose unit (which may be acetylated), a glucuronic acid unit, and a terminal mannose unit that may carry a pyruvate group. This branched architecture directly governs the viscosity profile, gel-like texture, and rheological behavior of a given grade. Because the standard pharmacopoeial specification for xanthan gum describes only the polymer category, not the precise branch structure, molecular weight distribution, or particle size, two products both labeled “xanthan gum” can behave very differently in the same application.

The functional property that distinguishes xanthan gum from most other hydrocolloids is its pronounced pseudoplasticity, commonly called shear-thinning behaviour. At rest or at low shear rates, xanthan gum solutions exhibit high apparent viscosity, keeping suspended particles distributed throughout a system. When shear is applied (through pumping, mixing, pouring, or swallowing), the viscosity drops dramatically, allowing free flow. When shear is removed, viscosity recovers almost instantly. This combination of high-rest viscosity and recoverable, shear-responsive flow is why xanthan gum is the go-to stabilizer in salad dressings and personal care creams.

Because Jungbunzlauer produces xanthan gum through biological fermentation, Jungbunzlauer’s xanthan gum qualifies as bio-based and fermentation-derived, supporting clean-label food formulations, COSMOS certification in natural cosmetics, and non-GMO positioning. Whether a fermentation-derived ingredient meets a specific “natural” standard varies by certification body and jurisdiction; formulators should confirm compliance with the applicable standard for their market.

“Biogums, such as xanthan gum and gellan gum are polymers. What these polymers look like, their molecular structure, is not exactly specified. But how that polymer exactly is, how many branches it has, and how it looks — that’s not exactly specified. So xanthan gum is not equal to xanthan gum. During production, you need to really make sure you know what you do, so that every time you produce something, the same quality comes out.”— Jens Birrer Vice President, Category Lead Texturants at Jungbunzlauer

What is xanthan gum made from?

Jungbunzlauer produces xanthan gum by fermenting glucose derived from non-GMO corn starch sourced from European agricultural suppliers. The corn starch is hydrolysed to yield a clean, well-characterized carbon source for the Xanthomonas campestris fermentation. The use of European corn ensures full traceability from field to fermentation vessel, aligns with EU agricultural standards, and supports clean-label positioning for brands that require documented ingredient origin.

The corn-derived substrate is the foundation for all downstream quality. Corn crops vary seasonally, and Jungbunzlauer works with a sufficient range of agricultural sources to maintain a consistent, well-characterized feedstock despite that natural variability. By sourcing from a diverse network of documented European and North American agricultural suppliers, Jungbunzlauer maintains consistent feedstock quality at a scale while providing full traceability and provenance of the raw materials.

How is xanthan gum made?

Jungbunzlauer produces xanthan gum through a tightly controlled, five-stage industrial fermentation process. Every stage is designed to maximise consistency in xanthan gum quality. The molecular architecture (including branch structure, viscosity profile, molecular weight distribution, and particle size) is determined during fermentation and downstream processing, not later in the supply chain. This is why process control at the production stage is so critical and why two manufacturers offering identical nominal specifications can deliver meaningfully different in-application performance.

Stage 1: Substrate preparation

The process begins with preparing a sterile fermentation medium. Corn-derived glucose is dissolved in purified water and supplemented with nitrogen sources, minerals, and trace elements required for microbial growth. The medium is heat-sterilized to eliminate competing organisms, then cooled to the optimal fermentation temperature. The purity and consistency of the substrate directly impact the yield and molecular regularity of the resulting polymer.

Stage 2: Fermentation

A pure culture of Xanthomonas campestris is inoculated into the sterile medium in closed, stainless-steel fermentation vessels. Under precisely controlled conditions of temperature, pH, aeration, and agitation, the bacteria synthesize and excrete xanthan gum as an extracellular polysaccharide into the fermentation broth. The fermentation parameters (particularly dissolved oxygen concentration, pH control, and temperature profile) are key to provide a product with reliable final viscosity and rheological character.

As García-Ochoa et al. (2000) established in their foundational review of xanthan production, recovery, and properties, fermentation conditions (agitation, aeration, and temperature) are the primary determinants of molecular weight distribution and viscosity performance in the finished polysaccharide. (Biotechnology Advances, 18(7): 549–579)

Stage 3: Recovery

Following fermentation, the xanthan-rich fermentation broth undergoes polymer precipitation. Isopropanol is typically added to selectively precipitate the xanthan gum from the fermentation broth, separating the polysaccharide from residual biomass, media components, and fermentation by-products. The precipitated polymer is separated and purified to reduce solvent and residual biomass to levels compliant with food, personal care, and pharmaceutical standards.

Stage 4: Drying

The wet xanthan gum washed precipitate is dried to reduce moisture content to specification. Temperature profile during drying influences the final hydration rate of the product, a critical application parameter for formulators working on dispersion-critical processes.

Stage 5: Milling

The dried xanthan gum is milled to a controlled particle size distribution. Milling directly determines hydration kinetics, dispersion behavior in aqueous systems, and suitability for specific application processes. Jungbunzlauer’s grade portfolio includes products milled to distinct particle size specifications.

The fermentation process determines xanthan gum’s key quality parameters: viscosity profile and particle size. These parameters are set during fermentation and milling, not later in the supply chain. This is why xanthan gum produced under rigorous, controlled fermentation conditions delivers consistent batch-to-batch performance.

What is xanthan gum used for?

Xanthan gum performs four core functional roles in formulations. These are not mutually exclusive. Most commercial applications draw on two or more simultaneously.

Thickening and viscosity building

Xanthan gum is an efficient thickener at low use concentrations, typically 0.1–1% w/w depending on the application and target viscosity. Its effectiveness is pH-independent over the range of 3–11 and thermally stable over a wide temperature range, making it suitable for acidic beverages and neutral food systems products alike. At rest, xanthan gum chains form a weak physical network that resists deformation and imparts perceivable viscosity that formulators measure as apparent viscosity at low shear.

Suspension and stabilization

The same physical network that builds viscosity also prevents sedimentation and oil droplets in liquid systems. Suspending herbs and spices in sauces & dressings, pigments in paints, active pharmaceutical ingredients in oral suspensions, and abrasive particles in oral care products are all stabilized by xanthan gum’s low-shear viscosity, without producing a texture that consumers perceive as thick or heavy. The product thins immediately under the shear of pouring or swallowing.

Pseudoplastic (shear-thinning) behaviour is xanthan gum’s most commercially important property

Xanthan gum’s shear-thinning behaviour is its most commercially important functional property. The transition from high viscosity at rest to low viscosity under shear is rapid, reversible, and independent of temperature across most processing conditions. This makes xanthan gum uniquely suited to applications where products must be workable in manufacturing but stable in packaging. Consumer usability (pourability, spreadability, mouthfeel recovery) is itself a quality parameter.

“Xanthan gum is thick when you don’t move it. If you keep it still, it stabilizes, becoming more thick from a sensory point of view. But if you start to swallow or move the product, it becomes more fluid. That’s a property that is very much appreciated in the area of dysphagia — for people who, due to sickness or age, have issues swallowing liquids.”— Jens Birrer Vice President, Category Lead Texturants at Jungbunzlauer

Syneresis prevention

In paste, emulsions, and frozen products, xanthan gum prevents syneresis (the separation of liquid from a structured matrix over time). This is particularly important in refrigerated dressings, dairy alternative yogurts, and baked goods, where water migration causes textural degradation. Xanthan gum’s three-dimensional network physically traps water, maintaining a homogeneous texture through the product’s shelf life.

Xanthan gum applications by industry

Jungbunzlauer’s xanthan gum portfolio covers five primary markets, as well as the broader range of food and industrial categories that rely on hydrocolloid-based texture solutions.

Food and beverage

Sauces and dressings are among the highest-volume food applications for xanthan gum. Xanthan gum delivers the characteristic thick-at-rest, thin-on-pouring behaviour of commercial pourable dressings and pumpable condiments. It stabilizes emulsified oil-water systems, prevents phase separation during storage, and maintains textural consistency through the thermal cycles of pasteurization and refrigeration.
Xanthan gum is not used across the full range of beverage formats, but it plays an important role in specific applications. It is widely used in powdered beverage mixes that reconstitute with water, where xanthan gum’s consistency ensures predictable hydration and suspension behaviour across lots. It also restores mouthfeel in sugar-reduced beverages. Jungbunzlauer’s Beverage Formulation Solutions guide covers specific grade and use-level recommendations across beverage categories.
Dairy alternatives (including plant-based milks, yogurt alternatives, and non-dairy ice cream) rely on hydrocolloids to replicate the texture and mouthfeel contributions of dairy proteins and fat. Xanthan gum contributes to emulsion stability in oat and nut milks, immobilisation of water to extend shelf life in ice cream and sherberts, and syneresis control in refrigerated formats. One formulation consideration in protein-containing dairy alternatives: xanthan gum is an anionic polymer and can interact with cationic plant proteins, which may affect texture or stability depending on the system. In high-protein dairy alternative yogurts, gellan gum is sometimes the better functional choice. Grade selection and system design matter; Jungbunzlauer’s application team can guide formulators through the right approach for their specific matrix.
Gluten-free baking is a well-established application in which xanthan gum replaces the viscoelastic network provided by gluten in wheat-based products. At concentrations of 0.2–0.5% in the flour blend, xanthan gum improves dough handling, traps CO₂ during fermentation and baking, and produces a finished crumb structure and crust texture that more closely resembles those of wheat bread. [12]
Bakery and confectionery applications extend to icings, fillings, fruit preparations, and moisture-controlled baked goods. Xanthan gum controls viscosity in pumpable fillings, stabilizes water activity in high-moisture inclusions, and prevents sugar crystallization in certain confectionery formats.

Personal care and cosmetics

Xanthan gum is not classified as organic itself, but because it’s produced via fermentation, it qualifies as a naturally derived ingredient under COSMOS standards, making it usable in COSMOS-certified natural and organic formulations (subject to individual certifier requirements)

Skin care formulators use xanthan gum as a primary thickener and texture agent in serums, lotions, creams, and masks. Its pseudoplastic behavior creates formulations that apply smoothly and spread easily on skin. Grade selection is critical here: some grades can impart a tacky or sticky skin feel if not matched correctly to the formula and application type. Jungbunzlauer offers grades specifically optimized for personal care that minimize this effect.
Oral care applications include toothpastes and gel toothpastes, in which xanthan gum stabilizes the dispersion of abrasive particles (calcium carbonate and silica) throughout the paste, prevents phase separation during storage, and contributes to extrudability and foam stabilisation.
Hair care formulators use xanthan gum in styling gels, conditioners, and mild, sulfate-free shampoos. Its gel-like capability at low concentration and pseudoplastic flow during application make it a high-performance, naturally derived option.

Pharmaceutical and nutraceutical

Tablet binder and sustained-release matrix: Xanthan gum is used in pharmaceutical solid dosage forms as a controlled-release matrix former. When incorporated into compressed tablets, it forms a viscous gel layer in contact with gastrointestinal fluids, controlling the rate at which active ingredients are released. Marinescu et al. (2025) investigated this application specifically with Jungbunzlauer-sourced xanthan gum, confirming reproducible sustained-release behavior as a function of the ingredient’s characterized molecular consistency. [7]
Oral liquids and suspensions: The suspension properties that make xanthan gum valuable in food beverages apply directly to oral pharmaceutical suspensions. Xanthan gum keeps active pharmaceutical ingredients suspended uniformly, ensuring dose accuracy (a pharmacopoeially critical requirement) while maintaining acceptable pourability and mouthfeel.
Dysphagia management: In one of xanthan gum’s fastest-growing pharmaceutical-adjacent applications, it thickens water and other beverages to standardized consistency levels as defined by the International Dysphagia Diet Standardization Initiative (IDDSI) for patients with swallowing disorders. Modified starch has traditionally been used for this purpose, but it produces a less pleasant product in terms of taste, appearance, and texture. It is also susceptible to viscosity breakdown from salivary amylase during consumption. Xanthan gum is not degraded by salivary enzymes and delivers a more consistent viscosity profile throughout consumption. Its pseudoplastic behavior is also clinically valuable: a thickened liquid remains stable at rest (supporting safe swallowing) but thins under the shear forces of swallowing, reducing the product’s perceived heaviness.

Industrial and home care applications

Household and industrial cleaners use xanthan gum to keep abrasives and active ingredients evenly distributed in liquid formulations and to improve the cling time of gel-format products on vertical surfaces.
Paints and coatings: Low-shear viscosity stabilizes paint during storage, preventing pigment sedimentation, while high-shear thinning allows clean application by brush, roller, or spray. Textile and paper applications include use as a thickener and carrier in textile printing pastes and as a surface sizing agent in paper production.
Agrochemical formulations: Xanthan gum is used to stabilize suspension concentrates in plant protection products, preventing particle settling and ensuring uniform application. It also serves as a gelling and viscosity-modifying agent in specialty fertilizer gel formats, improving handling and consistency. Its shear-thinning behavior supports easy mixing and spraying while maintaining stability during storage. Recent research supports xanthan gum as an eco-friendly alternative to synthetic polymers in agricultural applications, particularly in suspension concentrate and gel-based fertilizer formats.
Oil and gas drilling fluids: Xanthan gum’s shear-thinning behavior and stability across wide pH and temperature ranges make it an effective viscosifier in water-based drilling muds. It carries cuttings to the surface during drilling (high viscosity at low shear), allows easy pumping (low viscosity under pump shear), and helps maintain borehole stability.
The pronounced acid stability of selected grades also allows the use of xanthan gum as a thickener in acidic cleaners, including the option to keep the solution clear.

Xanthan gum safety and regulations

Xanthan gum has an extensive safety record spanning more than five decades of commercial use and is approved as a food additive in all major global regulatory jurisdictions.

Xanthan gum regulatory approvals around the world

United States: Generally Recognized as Safe (GRAS) under 21 CFR 172.695. Permitted in a wide variety of food categories without quantitative limits (quantum satis). Also listed in the USDA National Organic Program (NOP), xanthan gum can be used as synthetic ingredient in certified organic products.

European Union: Approved food additive E415 under Regulation (EC) No. 1333/2008. Re-evaluated by the European Food Safety Authority (EFSA) in 2017 and 2023 with no safety concerns identified at typical use levels. The EFSA Panel concluded that xanthan gum (E 415) is not of safety concern at the reported uses and use levels in food. Also in the EU organic framework, xanthan gum can be used as food additive for organic certified products of plant and animal origin.

Codex Alimentarius: Listed in the General Standard for Food Additives (GSFA) as INS 415. Assigned an acceptable daily intake (ADI) of “not specified” by JECFA, the most favorable safety classification in the system, indicating no quantitative limit is needed.

Personal care and cosmetics: Compliant with EU Cosmetics Regulation (EC 1223/2009). Fermentation-derived origin qualifies it as a naturally derived ingredient under COSMOS and NATRUE standards (subject to certifier requirements) but is not classified as organic itself.

Xanthan gum is safe at typical use levels

At the use levels encountered in food (0.05–0.5% w/w in most applications) and personal care products, xanthan gum is not digested or absorbed. It passes through the gastrointestinal tract essentially intact and is classified as a fiber. Studies confirm xanthan gum does not accumulate in the body, does not interfere with nutrient absorption at normal use levels, and has no documented allergenic potential. It is celiac-safe, non-GMO certifiable, and compatible with vegetarian, vegan, and halal/kosher requirements.

Contamination alerts are a sourcing risk, not an ingredient risk

The safety record of xanthan gum itself is well established and undisputed. The contamination alerts that procurement and food safety teams should be monitoring are not about xanthan gum as an ingredient. They are about the manufacturing conditions and quality controls of specific suppliers.

Since 2020, the EU Rapid Alert System for Food and Feed (RASFF) has recorded multiple notifications for xanthan gum sourced from manufacturers outside of Europe. The most recent wave of alerts relates to chlorate contamination. Its presence in xanthan gum at elevated levels is incompatible with use in EU food products, particularly in infant formula and products intended for young children, where exposure limits are most stringent.

Jungbunzlauer’s xanthan gum is produced in European facilities that operate under EU food safety standards, with full traceability and contaminant levels monitored and maintained within legally permitted thresholds.

Xanthan gum grades: why not all xanthan gum performs the same

Xanthan gum is not a single, uniform product. It is a category of structurally related polysaccharides whose in-application performance depends on molecular weight, viscosity profile, hydration rate, and particle size. These parameters are determined during fermentation and milling and vary significantly between manufacturers and between grades within a single manufacturer’s portfolio.

The consequence of this misunderstanding is real and measurable.

“The most common complaint from new or transitioning customers is inconsistency; the product doesn’t deliver the viscosity it’s supposed to. So they either add more material to compensate or remake batches entirely. Once you tally up the wasted material and rework, the costs add up quickly.That’s a risk many customers don’t see coming. They’re focused on the lower price tag without realizing how much it could actually be costing them.”— Iliana Nava, Americas Market Development Lead, Jungbunzlauer

Jungbunzlauer offers 40+ xanthan gum grades across every major application category

Food grades are optimized for viscosity stability, a clean flavour profile, and compliance with global food additive regulations.

Personal care grades are selected to meet the strictest microbiological requirements and designed for optionally clear gel and emulsion formulations in skin care, hair care, and oral care, including COSMOS-eligible grades for natural cosmetics designed for improved skin feel.

Pharmaceutical/nutraceutical grades are part of the food-grade range for tablet manufacture, oral suspension, and medical nutrition applications, including dysphagia-management grades.

Industrial grades are designed for drilling fluid, coating, cleaning product, agrochemical formulations, and textile applications where performance at extreme pH, temperature, or electrolyte concentration is required. Another benefit of xanthan gum in technical applications is its biodegradability.

What is the difference between xanthan gum grades?

Xanthan gum grades differ in molecular weight, viscosity profile, particle size, hydration rate, and application-specific functional properties. The standard specification (CAS 11138-66-2; E415; USP/Ph. Eur.) defines the polymer category but does not fix the precise parameters that determine in-application performance. When selecting a grade, formulators should consider three practical criteria: first, the intended application category (food, personal care, pharmaceutical, or industrial), since regulatory and functional requirements differ; second, whether the finished product requires optical clarity, as some grades perform better in transparent beverages, gels, and serums than others; and third, the dispersion system in the manufacturing process, since xanthan gum can be challenging to incorporate uniformly. Jungbunzlauer’s 30+ grades deliver defined, documented performance characteristics for specific applications.

Batch-to-batch consistency: what the peer-reviewed literature says about Jungbunzlauer xanthan gum

Jungbunzlauer’s xanthan gum batch-to-batch consistency is documented in independent scientific literature. Multiple peer-reviewed publications have specifically selected Jungbunzlauer-sourced material as the reference standard for quality and consistency in their research.

Marinescu et al. (2025) investigated xanthan gum as an excipient in sustained-release pharmaceutical formulations, specifically selecting Jungbunzlauer-sourced material for its well-characterized molecular consistency. The study confirmed reproducible release profiles directly attributable to polymer consistency across production batches. PMC (2023) research examining xanthan gum’s role in food texture systems referenced Jungbunzlauer material for reproducible rheological behavior across independent experimental runs, supporting its use as a reference standard in food texture research. A 2024 study published in Molecules used Jungbunzlauer product data for viscosity specifications and functional characterization in emulsion and gel systems relevant to personal care and nutraceutical applications.

This peer-reviewed citation record positions Jungbunzlauer xanthan gum as the reference material in academic and industrial research, a status that commodity suppliers cannot claim and consumer-facing ingredient databases cannot replicate.

Sourcing and supply chain considerations

The majority of the global xanthan gum supply originates from a small number of large-scale Asian manufacturers. For procurement teams that prioritize the lowest unit cost, this concentration has been manageable, until supply chain disruptions make it anything but. The pattern of quality disruptions, contamination alerts, and regulatory actions against Asian-sourced xanthan gum has accelerated, and procurement managers who treat xanthan gum as an undifferentiated commodity are increasingly exposed to risks that were not visible in their supplier qualification processes.

Contamination risk from Asian-sourced xanthan gum is a documented, recurring pattern

As detailed above, the EU RASFF has documented multiple contamination events in Asian-sourced xanthan gum over the past several years: first ethylene oxide, and now chlorate, which triggers substantiated concerns at European authorities and can result in mandatory product withdrawal from the European market.

Critically, chlorate is not part of standard specification testing. While heavy metals are a mandatory E415 requirement confirmed through regular (though not necessarily per-batch) testing, chlorate exceedances fall outside the standard testing panel and would not be caught by a routine certificate of analysis confirming viscosity, moisture, and ash content.

For food manufacturers selling into the EU (including North American exporters) the liability from a contaminated raw material incident is not limited to product replacement costs. It includes RASFF notifications, shelf removal, potential product recalls, and reputational damage affecting the entire product line. The risk-adjusted cost of the lowest-priced Asian-origin xanthan gum is structurally underestimated by procurement models that exclude the probability of contamination.

Anti-dumping tariff exposure adds unpredictable cost to Asian-origin xanthan gum

Xanthan gum produced in Asia and sold in the United States is subject to anti-dumping duty orders. For North American manufacturers purchasing Asian-origin xanthan gum, tariff exposure represents an additional landed cost that can significantly shift the economics of commodity sourcing and can change with trade policy developments on short notice. Jungbunzlauer’s European-origin supply is not subject to these duties, providing landed-cost predictability that Asian-origin commodity supplies cannot offer.

A dual-sourcing strategy requires a supplier with geographic redundancy

For manufacturers operating at scale, Jungbunzlauer offers genuine dual-source qualification from a single supplier, providing geographic redundancy, consistent quality across both sources, and a single commercial relationship. This is a supply chain resilience outcome that no Asian commodity supplier can replicate.

PROCUREMENT CHECKLIST

Qualifying a new xanthan gum source? Request these documents from any prospective supplier:

Verify confirmation on regulatory compliance, but also on potential other contaminants such as Chlroate
Facility audit documentation or third-party certification: BRC, FSSC 22000, or equivalent
Regulatory origin declaration: confirming country of manufacture
Anti-dumping duty status confirmation: for U.S. import

Work with Jungbunzlauer’s xanthan gum experts

Jungbunzlauer’s depth in xanthan gum extends beyond the product itself. Our application center, our technical support and market development teams are available to support your formulation work, ingredient qualification, and supply chain decision-making at every stage.

From food and beverage to personal care and industrial applications, xanthan gum remains one of the most reliable multifunctional ingredients available, provided it’s sourced with consistent quality and full traceability. If you’re exploring xanthan gum for your next formulation, our team is ready to help you find the right fit. Reach out to discuss your specific requirements.