Several clean-label beverage stabilizers prevent settling and separation, and each one works through a different mechanism. High-acyl gellan gum suspends particles by forming a weak fluid gel at 0.02 to 0.06%. Pectin keeps protein dispersed in acidified milk drinks and juice-protein blends. Gum acacia (gum arabic) stabilizes flavor and oil emulsions at the oil-water interface. Xanthan gum, guar gum, and locust bean gum raise continuous-phase viscosity. Citrus fiber, microcrystalline cellulose, and soluble soybean polysaccharide fill specific niches where fiber claims, acid stability, or low viscosity matter. The right choice depends on what is separating (solid particles, protein, or oil droplets), the pH and mineral content of the base, and the thermal process the beverage will see.

This guide covers the physics behind settling, the stabilizers formulators most often use in clean-label beverages, their regulatory status in the EU and US, and the test methods that confirm a system will hold through shelf life. It also covers a complementary approach: reducing the size and density difference of the dispersed material so the stabilizer has less work to do.

Why Beverages Settle, Cream, and Ring

Settling and creaming are both forms of gravitational separation, and Stokes' law describes both. The velocity at which a particle or droplet moves through a liquid rises with the square of its radius and with the density difference between the particle and the liquid, and it falls as the viscosity of the continuous phase rises. A McGill University doctoral thesis on the rheology and stability of beverage emulsions (Taherian, 2006) sets out the equation and its consequences: dense particles such as cocoa, calcium salts, or protein aggregates move down and form sediment, while oil droplets, which are lighter than water, move up and form the whitish ring at the neck of a bottle that formulators call "ringing."

Stokes' law points to three levers. A formulator can shrink the particles or droplets, close the density gap, or change the rheology of the continuous phase. Conventional beverage emulsions have historically closed the density gap with weighting agents such as sucrose acetate isobutyrate, ester gum, or brominated vegetable oil. Those options are narrowing. The US Food and Drug Administration revoked the authorization for brominated vegetable oil as a stabilizer for flavor-oil emulsions in beverages, effective August 2, 2024, with a compliance deadline of August 2, 2025. Clean-label programs that exclude weighting agents are left working on particle size and continuous-phase rheology, which is where hydrocolloid beverage stabilizers operate.

Rheology-based stabilization takes two forms. Thickeners such as xanthan raise apparent viscosity at low shear, which slows particle movement. Fluid-gel formers such as high-acyl gellan create a weak three-dimensional network with a yield stress that holds particles in place at rest, then breaks and re-forms under shear so the beverage still pours and drinks like a liquid. The second approach suspends particles with far less added viscosity, which is why gellan is widely used in plant milks and calcium-fortified systems.

Clean-Label Beverage Stabilizers by Mechanism

High-acyl gellan gum: suspension with minimal viscosity

High-acyl gellan gum provides suspension at very low dosages in neutral and mildly acidic beverages. Supplier application data report use levels of about 0.02 to 0.06% in plant milks and 0.015 to 0.04% in ready-to-drink coffee, with effectiveness across roughly pH 3.4 to 7.5 and stability through pasteurization, UHT, and hot-fill processing, according to Cinogel's high-acyl gellan technical notes. The gum must hydrate above about 80°C and then cool under controlled conditions to form the fluid gel. Calcium and magnesium strengthen the network, so calcium-fortified formulas need the gellan dose tuned to the mineral load, and excess divalent cations can cause rigidity or gel lumps.

Low-acyl gellan forms firmer, clearer, more brittle gels. Formulators blend low-acyl and high-acyl grades to balance firmness against elasticity, and low-acyl grades assist suspension in some neutral dairy systems. The EFSA 2018 re-evaluation of gellan gum (E 418) concluded there is no need for a numerical acceptable daily intake and no safety concern at reported use levels. In the US, gellan is permitted under 21 CFR 172.665 as a stabilizer and thickener.

Pectin: protein stabilization in acidic drinks

Pectin is an established clean-label option for acidified milk drinks, drinkable yogurts, and juice-protein beverages where casein or plant proteins aggregate near their isoelectric point. Pectin interacts with the protein to keep it dispersed, and low-methoxyl grades also gel through calcium bridging. Practical levels in acidified milk drinks run about 0.2 to 0.5%, depending on calcium content, pH, and target viscosity, per supplier guidance on low-methoxyl pectin. Pectin is neutral in taste and color, but it is susceptible to residual pectinase activity, so enzyme carryover from fruit processing must be controlled. The EFSA re-evaluation of pectin (E 440) found no safety concern at reported uses and no need for a numerical ADI.

Gum acacia: emulsion stabilization at the interface

Gum acacia (gum arabic, E 414) is a hydrocolloid that also acts as an emulsifier. Its protein-rich fraction adsorbs at the oil-water interface and forms a film that resists droplet flocculation and coalescence across roughly pH 3 to 9, while adding very little viscosity. Gum arabic is used industrially in coffee and tea RTD systems and in confections, and it is one of the surface-active hydrocolloids evaluated in the McGill thesis on citrus cloud emulsions cited above. The trade-off is dose: gum acacia often needs high concentrations relative to the oil phase. OSA-modified starches are the common functional alternative but carry a "modified starch" declaration that many clean-label programs exclude. The EFSA re-evaluation of acacia gum (E 414) found no safety concern at reported use levels.

Xanthan, guar, and locust bean gum: viscosity control

Xanthan gum builds low-shear viscosity and shear-thins strongly, which slows particle movement at rest while keeping the beverage drinkable. It is stable across pH 2 to 12 and through thermal processing, according to Jungbunzlauer's technical overview. Beverage use levels typically fall between 0.05 and 0.2%, per BSH Ingredients' application guide. Overdosing produces a stringy or slimy mouthfeel, so xanthan is often blended with other hydrocolloids.

Guar gum and locust bean gum are galactomannans that synergize with xanthan and with kappa-carrageenan. Locust bean gum is used in fluid milks at about 0.05 to 0.085% and is described by suppliers as heat stable, neutral in flavor, and compatible with organic positioning, per Colony Gums. Guar has shown better freeze-thaw performance than locust bean gum in starch gel studies, which matters for frozen or chilled formats.

Citrus fiber and cellulose systems

Citrus fiber combines pectic substances with insoluble fiber and provides clouding, water binding, and some emulsification while declaring as "citrus fiber" on the label. Supplier recommendations run 0.10 to 0.60% for acidified protein drinks and 0.10 to 2.0% for fruit and tomato juices, per Fiberstar's beverage application page. The material needs a defined shear and hydration protocol to activate fully without clumping, and the supplier advises against combining it with competing emulsifiers. A peer-reviewed study on milk-based cocoa beverages evaluated citrus fiber as a clean-label stabilizer for cocoa particle suspension. Citrus fiber has GRAS documentation in the US, including GRAS Notice 943.

Colloidal microcrystalline cellulose with carboxymethylcellulose forms a particulate network that suspends cocoa and protein in UHT and retorted beverages without thermal gelation. It performs well, but the E 460 and E 466 declarations and the "cellulose gel" label name are not accepted by every clean-label standard, so retailer policy should be checked before use.

Soluble soybean polysaccharide: low-viscosity acid stability

Soluble soybean polysaccharide (SSPS) is a pectin-like polysaccharide with protein side chains that adsorbs onto protein surfaces in acidic milk drinks and stabilizes oil droplets without raising viscosity. A peer-reviewed review of soybean soluble polysaccharides describes its structure and protein stabilization mechanism. It is used in protein-containing acidic beverages and other systems where a thin texture is required.

Carrageenan: effective but contested

Kappa-carrageenan interacts with casein to form a weak thixotropic network that suspends cocoa in chocolate milk at 0.02 to 0.05%, which is why it remains common in dairy. Its clean-label position is mixed. The EFSA 2018 re-evaluation of carrageenan (E 407) kept the group ADI of 75 mg/kg body weight per day but designated it temporary pending additional data on chemistry, exposure, and toxicology. In the US organic sector, the National Organic Standards Board recommended removing carrageenan from the National List at its 2018 sunset review, citing gellan, guar, and xanthan as available alternatives. The USDA Agricultural Marketing Service did not adopt that recommendation and renewed the listing, stating that substitutes do not replicate every function. Carrageenan therefore remains on the National List, but retail and clean-label acceptability in the US is ambiguous, and formulators targeting channels that exclude it typically substitute gellan or gellan-locust bean gum blends.

Regulatory Status at a Glance

• Gellan gum: EU E 418, no numerical ADI needed (EFSA 2018); US 21 CFR 172.665.

• Pectin: EU E 440, no safety concern at reported uses (EFSA re-evaluation); US GRAS.

• Gum acacia: EU E 414, no safety concern at reported uses (EFSA re-evaluation); US GRAS.

• Xanthan gum: EU E 415; US permitted food additive.

• Guar gum and locust bean gum: EU E 412 and E 410; US GRAS affirmed under 21 CFR 184, including 21 CFR 184.1339 for guar gum.

• Carrageenan: EU E 407, temporary group ADI of 75 mg/kg bw/day (EFSA 2018) with an open EFSA call for data covering uses including infant foods; US permitted and on the National Organic Program list, with ambiguous retail acceptability.

• Citrus fiber: US GRAS notices on file for specified uses; declaration rules vary by market.

Each stabilizer above has an EU E-number and a US permitted or GRAS pathway, with ingredient-specific caveats such as infant-category data requests. Whether a retailer standard, organic certifier, or brand policy accepts the declaration is a separate question, and those policies change. Verify the current list for each target channel before locking a formula.

Reducing the Stabilizer Load: Particle Size and Solubilization

Stabilizers manage the symptom of separation. The size and density of the dispersed material determine how severe the symptom is. Because Stokes' law scales with the square of the radius, halving droplet size cuts creaming velocity by a factor of four, and a fine emulsion needs far less rheological support than a coarse one. Published work on soluble soybean polysaccharide illustrates the target: a process patent on water-soluble soybean polysaccharides uses average droplet diameters at or below 1 to 1.5 micrometers under defined stirring conditions as the marker of a stable, low-viscosity emulsion.

This principle matters most for functional beverages that carry fat-soluble actives. Omega-3 oils, vitamins A, D, E, and K, curcumin, lutein, astaxanthin, and lipophilic botanical extracts do not dissolve in water. Added as oils or crystalline powders, they create the exact density and size mismatch that drives ringing, sediment, and surface oil, and the formulator then adds stabilizers and emulsifiers to compensate. The distinction between true dissolution, dispersion, and suspension explains why: a suspended or dispersed active remains a separate phase that gravity acts on, while a water-soluble form does not.

Our approach at Infusd addresses this upstream of the stabilizer system. We use a proprietary physical process with natural stabilizers to convert fat-soluble and hard-to-solubilize ingredients into water-soluble liquid and powder forms, without harsh chemicals or artificial emulsifiers. The resulting ingredients carry active payloads of 10% or more, dissolve in water with minimal agitation, and have held potency for 24 or more months in real-time studies after pasteurization or UHT treatment. The same process applies to flavor systems and spice extracts without chemical emulsifiers or weighting agents, and to natural colors that resist ringing, fading, settling, and separation. A beverage built on water-soluble actives still needs a stabilizer for other dispersed components such as protein, cocoa, or pulp. The active itself no longer contributes the oil-phase density mismatch that drives ringing, which may allow a lighter stabilizer system; published comparative data quantifying that reduction for specific actives is limited, so teams should run head-to-head stability studies against their current formula. Formulation teams can discuss specific matrices through our Formulate with Us page. Our article on vitamin solubility and formulation covers the bioavailability side of the same question.

How to Test a Beverage Stabilizer System

No universal numeric acceptance thresholds exist for beverage stability; supplier literature and peer-reviewed studies describe methods but leave pass/fail criteria to product-specific R&D. A practical screening protocol includes the following steps.

1. Particle and droplet size distribution. Measure by laser diffraction after processing and again at intervals through storage. Growth in D90 signals flocculation or coalescence before visible separation appears.

2. Rheology. Record low-shear viscosity and, for fluid-gel systems, yield stress. Confirm that the network survives the full thermal process and re-forms after pumping and filling.

3. Accelerated separation. Centrifugation and optical dispersion analyzers (Turbiscan, LUMiSizer) rank candidate systems within hours. Correlate accelerated results with real-time data before using them as a release criterion.

4. Thermal and pH challenge. Run the stabilizer through the intended pasteurization, UHT, hot-fill, or carbonation step at the final pH and mineral load. Gellan, carrageenan, and pectin all respond to calcium and pH changes.

5. Freeze-thaw and cold storage. Include cycles for chilled and frozen formats; galactomannan performance differs across freeze-thaw.

6. Real-time shelf life. Store at ambient and elevated temperatures, inspect for ringing, sediment, cloud loss, and syneresis at defined intervals, and confirm sensory stability alongside physical stability.

Selecting a Stabilizer by Beverage Type

• Plant milks and calcium-fortified neutral drinks: high-acyl gellan at 0.02 to 0.06%, with calcium dose and cooling profile controlled; locust bean gum or guar for additional body.

• Acidified milk and juice-protein drinks: pectin at 0.2 to 0.5%, or soluble soybean polysaccharide where a thin texture is required.

• Flavor and cloud emulsions in clear or carbonated drinks: gum acacia at the interface, or citrus fiber as an alternative, with droplet size reduction to minimize the dose; water-soluble flavor and color systems where available.

• Chocolate and cocoa dairy drinks: kappa-carrageenan where accepted, gellan or gellan-locust bean gum blends where it is not, or citrus fiber for a fiber-forward declaration.

• Functional drinks with fat-soluble actives: convert the active to a water-soluble form first, then stabilize the remaining dispersed phases with the lightest system that passes testing.

Frequently Asked Questions

Which beverage stabilizers are considered clean label?

Pectin, locust bean gum, guar gum, and gum arabic have documented positive consumer recognition, and gellan, xanthan, and citrus fiber are also widely used in clean-label beverages, according to Food Processing's review of gums and clean label. Chemically modified polymers are less compatible with clean-label strategies, and carrageenan and cellulose derivatives are legal and effective but face ambiguous acceptance under some retailer and brand standards. Acceptance is defined by each program's ingredient policy rather than by regulation, so confirm the current list for each channel.

What is the best stabilizer to prevent settling in plant-based milk?

High-acyl gellan gum is the most common choice. It suspends particles at 0.02 to 0.06% by forming a fluid gel with a yield stress, adds little viscosity, and survives UHT and pasteurization. The dose must be adjusted for calcium content, since calcium strengthens the gellan network, and the gum must hydrate above about 80°C before controlled cooling.

How much gellan gum is used in beverages?

Typical beverage use levels are 0.015 to 0.06% depending on the matrix. Ready-to-drink coffee sits at the low end (0.015 to 0.04%) and plant milks and protein drinks at the higher end (0.02 to 0.06%). Grade selection and testing against the final protein, mineral, and heat profile determine the correct dose.

Why do oil-based ingredients separate in beverages even with a stabilizer?

Oil droplets are lighter than water, so they rise according to Stokes' law. A stabilizer slows the rise by raising viscosity or building a yield-stress network, but it cannot eliminate the density difference. Large droplets, inadequate interfacial coverage, or a stabilizer that breaks down during thermal processing all allow creaming and ringing. Reducing droplet size, improving interfacial stabilization, or converting the oil-soluble ingredient into a water-soluble form addresses the cause rather than the symptom.

Is carrageenan allowed in organic beverages in the US?

Carrageenan remains on the USDA National List of allowed non-synthetic substances for organic handling. The National Organic Standards Board recommended its removal at the 2018 sunset review, but the USDA Agricultural Marketing Service renewed the listing in its April 2018 rule. Retail and brand acceptance in the US is ambiguous, so confirm current policy with the certifier and target retailers before relying on carrageenan for organic positioning.

Does carbonation affect beverage stabilizers?

Carbonated beverages depend on interfacial stabilization and small droplet size for flavor and cloud emulsions rather than on yield-stress suspension networks. Citrus fiber is marketed for carbonated and RTD drinks as a gum arabic or modified starch replacer, per Fiberstar, and our water-soluble ingredients are documented as remaining stable after carbonation on our technology page. Any stabilizer or solubilized active intended for a carbonated product should be tested in the carbonated base rather than in still water.

This article is for informational purposes and does not constitute medical or nutritional advice. Consumers should consult a healthcare provider before starting any new supplement or functional product.