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Guar gum is a naturally derived polysaccharide extracted from the seeds of the guar plant, supplied as a colourless, odourless, free-flowing powder built from a blend of galactose and mannose sugars. Its neutral chemistry and strong thickening behaviour make it a sought-after ingredient in cosmetics and personal care, where its plant origin supports the growing demand for natural and sustainable beauty solutions.
For product developers, the key technical questions are not simply whether guar gum thickens a formula, but how its mannose-to-galactose structure produces such high viscosity, how hydration and shear affect its rheology, how it behaves across the pH and temperature range of real processes, and how modification changes its flow properties. This guide consolidates those considerations into a practical B2B formulation framework.
| Function | Suitable Users | Core Technical Indicators | Compliance Framework |
|---|---|---|---|
| Viscosity modifier / thickener | Formulators of moisturisers, serums, masks and hair care who need natural thickening and body | CAS 9000-30-0; molecular weight 200,000-2,000,000 Da; viscosity 350-700 mPa·s at 1 percent | FDA GRAS; EU cosmetic inventory; CIR-assessed safe for cosmetic use |
| Binder | Developers of powders, pastes and compacts who need ingredients held together in a smooth, consistent matrix | Holds ingredients together and gives a smooth, consistent texture; works at 0.5-2.0 percent | Permitted as a cosmetic ingredient; claims such as natural, vegan and non-GMO are product-specific |
| Emulsion stabiliser | Formulators of emulsions seeking to prevent oil and water phase separation over shelf life | Non-ionic; stable over pH 1.0-10.5; prevents separation, syneresis and sedimentation | No restricted-use status; assessed for genotoxicity and irritation by CIR |
| Film-forming agent | Brands developing products that retain moisture and shield skin or hair from environmental stress | Forms a thin film on skin or hair; adds emollient and sensory benefits | Cosmetic use only; no unsupported barrier or therapeutic claims permitted |
Guar gum is a complex carbohydrate comprising mannose and galactose molecules connected by glycosidic bonds. Mannose forms the polymer backbone, linked together by beta (1-4) glycosidic bonds, while galactose branches attach to the mannose backbone through alpha (1-6) glycosidic bonds. The mannose-to-galactose ratio is approximately 2:1, and the molecular weight varies considerably with processing, commonly reported between 200,000 and 2,000,000 Da.
That branched structure explains the material's defining behaviour. Because the galactose side chains interrupt what would otherwise be a tightly packed linear chain, the polymer cannot crystallise easily and instead remains open and water-loving. Strong hydrogen bonding and extensive intertwining of the molecules then allow guar gum to form highly viscous solutions when it is mixed with water, even at low concentrations.
In personal care, guar gum is a versatile functional ingredient rather than a single-purpose additive. It thickens, binds, stabilises emulsions and forms films, and it does so in a way that suits brands positioning products around natural and sustainable ingredients. Its neutral chemical composition and plant origin are important parts of its commercial appeal.
Explore the guar gum technical encyclopedia for additional chemical and application information.
| Parameter | Specification / Description |
|---|---|
| Chemical name | Galactomannan polysaccharide (guaran) |
| Common names | Guar gum, guaran, guar galactomannan |
| Structural formula | Mannose backbone with galactose branches, ratio approximately 2:1 |
| Molecular weight | Variable, approximately 200,000-2,000,000 Da |
| CAS Number | 9000-30-0 |
| EC / EINECS number | 232-536-8 / 232-536-0 |
| Appearance | Free-flowing powder, yellow to white, odourless |
Guar gum is a rheology modifier, and its behaviour cannot be reduced to a single thickening number. Three linked mechanisms govern how it performs: the hydration that builds viscosity, the shear response that determines how a product spreads, and the network it forms with other ingredients to stabilise a formulation.
Guar gum swells or dissolves in a polar solvent by forming strong hydrogen bonds, whereas in non-polar solvents only weak hydrogen bonds form. Once fully hydrated it produces a thick colloidal dispersion, and doubling the concentration leads to roughly a tenfold increase in viscosity because intermolecular chain interaction and entanglement rise sharply with concentration.
A fully hydrated guar gum dispersion is thixotropic: its resistance decreases as the shear rate increases, and dilute solutions are less thixotropic than concentrated ones. The material also shows shear-thinning behaviour, meaning viscosity falls as shear rate or stress rises, and once the shear force is removed the viscosity recovers. Aqueous guar solutions do not exhibit yield stress.
Because guar gum forms a network that holds ingredients together, it helps prevent phase separation, syneresis and sedimentation, which extends shelf life and preserves efficacy over time. It also improves emulsion stability, making formulations less prone to breaking, and it contributes to sensory quality by making the texture smoother, silkier and more emollient.
Guar gum is derived from the seeds of the guar plant through a sequence of mechanical and aqueous steps. The seeds are first dried and then mechanically dehusked to separate the outer shell from the endosperm, which is the fraction that contains the galactomannan. The endosperm is ground and mixed with water to create a slurry, which then undergoes purification and gum precipitation before the gum is dried and finely powdered for the intended application.
Guar gum has been used for centuries, originally in India as a thickener in traditional foods such as curries, gravies and desserts, and its excellent thickening, stabilising and binding properties mean it now serves food, pharmaceutical, textile and cosmetic applications. For cosmetic buyers, the qualification points are purity, particle size and hydration behaviour, because processing conditions influence viscosity and the finished grade must be matched to the intended product form.
From a formulation perspective, the relevant comparisons are among guar gum, its modified derivatives and the other natural hydrocolloids it may substitute for, because these determine which grade suits a given product. The family is defined by the galactomannan backbone and by how that backbone is modified.
Native guar gum is the unmodified galactomannan. It is non-ionic, hydrates readily, shows strong shear thinning that increases with molecular weight, and gives stable solutions over a wide pH range. Its intrinsic viscosity correlates directly with molecular weight, which is why molecular weight is a leading specification for the material.
Substitution alters the flow properties of the polymer in ways that can be both important and unexpected. Attaching a hydrophobic hydroxypropyl group lowers the zero-shear value and relaxation time relative to native guar gum, whereas hydrophilic sodium carboxymethyl substitution raises viscosity at lower concentrations, likely through the electroviscous effect of polyelectrolytes. Hydrophobic long-chain derivatives such as oleic, linoleic and erucic guar gum show more robust shear thinning at 1 percent, and the molar substitution ratio further tunes the rheology.
Guar gum is often used alongside other naturally derived thickeners, including gum arabic and konjac gum, in formulations where a specific balance of texture, clarity and hydration rate is required. As the shampoo example below shows, combining hydrocolloids lets formulators tune rheology and sensory feel more finely than relying on a single gum.
| Parameter | Native Guar Gum | Hydroxypropyl Guar | Carboxymethyl Guar |
|---|---|---|---|
| CAS number | 9000-30-0 | 39421-75-5 | 39346-76-4 |
| Chemical type | Non-ionic galactomannan polysaccharide | Hydrophobically modified galactomannan | Anionic carboxymethyl galactomannan |
| Charge | Non-ionic, giving wide pH tolerance | Largely non-ionic with hydrophobic character | Anionic, introducing polyelectrolyte behaviour |
| Rheology | Strong shear thinning that rises with molecular weight | Lower zero-shear value and shorter relaxation time | Higher viscosity at lower concentration than native gum |
| Primary use | General thickening, binding and stabilising | Sensory-tuned thickening and conditioning | Efficient thickening for anionic-compatible systems |
| Formulation advantage | Natural, plant-based and cost-effective | Altered flow and feel without changing the backbone | Greater thickening power per unit mass |
| Key limitation | Viscosity sensitive to shear, temperature and low-pH heat | Lower viscosity than native gum at equal loading | Charge can interact with other ionic ingredients |
| Property | Typical Description |
|---|---|
| Physical form | Free-flowing powder |
| Colour and odour | Yellow to white and odourless, with a slightly bitter taste |
| pH (solution) | 6.5-7.5, and stable across about pH 1.0-10.5 at ambient conditions |
| Density at 25 °C | 0.8-1.0 g/mL |
| Viscosity (1 percent, water, 20 °C) | 350-700 mPa·s |
| Gelling temperature | 25-40 °C |
| Melting point | Above 220 °C, with degradation around 300 °C under neutral conditions |
| Solubility and storage | Highly soluble in water; store at ambient conditions away from moisture |
| Function | Typical Applications | Key Formulation Objective |
|---|---|---|
| Binder | Powders, masks and compacts across skin and hair care | Hold ingredients together and give a smooth, consistent texture |
| Viscosity modifier | Moisturisers, serums, eye creams and cleansers | Improve spreadability and texture for better application and absorption |
| Emulsion stabiliser | Lotions, creams, sunscreens and after-sun products | Prevent separation and keep the product uniform and stable |
| Film former | Hair styling gels, conditioners and leave-on skin products | Form a protective, moisture-retaining film on skin or hair |
Typical product examples by category include moisturisers, serums, face masks, eye creams and eye serums under skin care; shampoos, conditioners and styling gels under hair care; foundations, concealers and lipstick under makeup; and sunscreen and after-sun products under sun care. Guar gum's role in each is to improve texture and stability while supporting a gentle, natural-positioning story that appeals to consumers.
Set the target rheology first and choose a grade with the appropriate molecular weight and particle size, since intrinsic viscosity correlates directly with molecular weight and particle characteristics govern hydration. Typical cosmetic dosage is about 0.5-2.0 percent depending on the application and the desired body.
Guar gum must be dispersed evenly to avoid lumps, then allowed to hydrate fully to develop viscosity. Because shear thinning is reversible but micronisation and excessive mechanical or ultrasonic energy can permanently reduce viscosity, the dispersion stage should use controlled shear and be validated against the grade's hydration behaviour.
As a non-ionic polymer, guar gum gives stable solutions across a wide pH range at ambient conditions, which simplifies formulation. The caution is hot, low-pH processing, where acid hydrolysis becomes more prominent and viscosity falls; such systems should be evaluated at their true process temperature and pH rather than at neutral bench conditions.
Beyond viscosity, guar gum changes texture, making products smoother and more emollient, and it can enhance spreadability and absorption without leaving a greasy or sticky residue. Because these effects are subjective, the formulation should be assessed by a trained sensory panel in addition to instrumental viscosity measurement.
The following formulation is an illustrative technical example rather than a universal commercial recipe. Actual guar gum levels and the surrounding formula must be recalculated according to the target texture, stability and sensory requirements of each project.
| Ingredient | Illustrative Quantity | Technical Role |
|---|---|---|
| Sorbitol (70 wt% aqueous) | 21% | Humectant and viscosity contributor |
| Guar gum | 0.1% | Secondary thickener and binder |
| Calcium carbonate and silica | 42% and 2% | Abrasive and structuring particulate phase |
| Carboxymethyl cellulose | 1% | Primary polymeric thickener working with guar gum |
| Sodium monofluorophosphate and saccharin | 1.1% and 0.27% | Active and sweetener |
| Deionised water and flavour | Up to 100% | Continuous phase and organoleptic modifier |
Regulatory treatment of guar gum depends on the product category and the destination market. A statement that a material is cosmetic grade does not by itself establish compliance, so the summaries below should be treated as orientation rather than as a compliance determination.
| Market / Framework | Technical Relevance | Compliance Action |
|---|---|---|
| United States FDA | Guar gum, obtained from maceration of the guar seed, is generally regarded as safe under the US FDA. | Confirm the material matches the GRAS identity and the intended use category. |
| European Union | The EU Cosmetics Inventory lists guar gum among permitted ingredients. | Verify the current inventory entry and any labelling obligations. |
| Cosmetic Ingredient Review (CIR) | CIR assessed guar gum and its derivatives and concluded they were safe for cosmetic and personal care use. | Use the CIR conclusion as supporting evidence in the safety dossier. |
| National authorities | Many markets treat guar gum as an established cosmetic and food ingredient, but permitted categories and labelling rules differ. | Review requirements locally, as they can change by jurisdiction. |
| Claims and standards | Claims such as natural, vegan, plant-based and non-GMO are product-specific and depend on the actual supply chain. | Substantiate each claim with supplier documentation before it reaches the label. |
| ISO / HACCP-style controls | Guar gum is a dry botanical powder, so microbiological and allergen controls support consistent quality. | Maintain supplier qualification, batch traceability and specification testing. |
The safety of guar gum in personal care has been assessed by the Cosmetic Ingredient Review Expert Panel, which reviewed data indicating that guar gum was not genotoxic, not carcinogenic and not a developmental toxicant. Guar gum and its derivatives were also found not to be dermal irritants or sensitizers, and on the basis of the available data the panel concluded that guar gum is safe for cosmetic and personal care products.
Because guar gum is a high-molecular-weight polysaccharide that is not readily absorbed through intact skin, its topical safety profile is generally favourable, and there is no restricted-use status attached to it in the markets reviewed. As with any botanical-derived ingredient, quality control should focus on purity, microbiological quality and the absence of contaminants that can vary with agricultural source.
For product developers, the most important practical principle is to separate the functional role of guar gum from any implied health benefit. Guar gum can improve texture, spreadability and moisture retention, but a cosmetic product should not carry unsupported claims that imply treatment or prevention of disease, and any statement about its skin or hair benefits should be traceable to substantiated evidence.
| Parameter | Reference Value | Practical Note |
|---|---|---|
| Typical cosmetic dosage | 0.5-2.0% | Selected according to the target texture and product form |
| Solution viscosity (1%, water, 20 °C) | 350-700 mPa·s | Measured under defined hydration and shear conditions |
| Stable pH range | About 1.0-10.5 at ambient conditions | Acid hydrolysis becomes more prominent at higher temperatures |
| Gelling temperature | 25-40 °C | Relevant to processing and to product feel on skin |
| Concentration effect | Doubling concentration can raise viscosity about tenfold | Explains why small dosing changes alter texture markedly |
These figures are reference values drawn from published regulatory positions and general application data; they are not a substitute for product-specific assessment, and the applicable limits must be verified for each market.
Guar gum is a galactomannan with a mannose backbone and galactose branches at roughly a 2:1 ratio. The branches keep the chain open and water-loving, and strong hydrogen bonding plus extensive chain entanglement let even a small amount of gum build high viscosity in water.
Fully hydrated guar gum is shear-thinning and thixotropic: viscosity falls as shear rate rises and recovers when the force is removed. Dilute solutions are less thixotropic than concentrated ones, and aqueous guar solutions do not show a yield stress, which matters when predicting how a product will spread and flow.
It depends on the target. Native gum is non-ionic, natural and cost-effective for general thickening. Modified grades tune the flow: hydroxypropyl substitution lowers the zero-shear value and relaxation time, while carboxymethyl substitution raises viscosity at lower concentrations, so the choice should follow the sensory and rheological goal rather than habit.
Guar gum is stable across a wide pH range at ambient conditions because it is non-ionic, but at higher temperatures acid hydrolysis becomes more prominent and viscosity loss is more marked at low pH. Systems that are both acidic and hot should therefore be evaluated under their true process conditions rather than assumed to behave like a neutral solution.
| Identifier | Value | Resource |
|---|---|---|
| INCI name | Cyamopsis Tetragonoloba Gum | Technical encyclopedia |
| CAS Number | 9000-30-0 | Chemical dictionary |
| CAS product lookup | 9000-30-0 | Supply search |
| Supplier / trade search | 9000-30-0 | Supplier search |
1. Cosmetic Ingredient Review. Safety assessment of galactomannans, including guar gum.
2. U.S. Food and Drug Administration. Generally recognized as safe status of guar gum.
3. European Commission. Cosmetics Inventory entry for guar gum.
4. Re-evaluation of guar gum as a food additive, published scientific review.
5. Studies in the rheological behaviour of guar gum solutions.
6. Certain rheological aspects of functionalized guar gum, published research.
7. Guar: agronomy, production, industrial use and nutrition, technical monograph.
8. Publications on guar gum in cosmetic formulation, best practices and applications.
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