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Guar gum in cosmetics works as a natural thickener, suspending agent and emulsion stabiliser, while its cationic derivative, guar hydroxypropyltrimonium chloride, is the main conditioning polymer used in shampoo. Native guar builds viscosity at 0.1–1%. Cationic guar conditions hair at 0.1–0.5% by depositing on hair during rinsing.
Guar gum (INCI: Cyamopsis Tetragonoloba (Guar) Gum; CAS 9000-30-0; E412) does several different jobs in a shampoo, and the version you buy decides which one you get.
Guar gum is a natural galactomannan polysaccharide taken from the endosperm of the guar bean (Cyamopsis tetragonoloba), a drought-tolerant legume grown mainly in India and Pakistan. Its structure is a linear mannose backbone with galactose side units attached at a mannose-to-galactose ratio of roughly 2:1. That comparatively high galactose content is why guar gum dissolves in cold water, while locust bean gum (about 4:1) and cassia gum (about 5:1) do not.
India accounts for roughly 80–85% of global guar seed and gum output, with Pakistan at about 10–12%, according to the National Bulk Handling Corporation’s Seasonal Commodity Insight – Guar Seed report. Within Pakistan, the same report puts Sindh at around 59% of national guar seed production and Punjab at around 36.6%, with smaller volumes from Khyber Pakhtunkhwa and Balochistan.
For labelling and specification, use the INCI name Cyamopsis Tetragonoloba (Guar) Gum, CAS 9000-30-0, and food additive code E412.
The first decision a shampoo maker has to get right is which type of guar to buy, because three very different materials are sold under the name “guar gum”. Native or food-grade guar is a non-ionic thickener. Cosmetic-grade guar is the same molecule held to tighter purity, colour, particle-size and microbial limits. Cationic guar is chemically modified to carry a positive charge, which turns it into a conditioning polymer. Buying the wrong one is the most common reason a shampoo underperforms on hair feel.
Native guar gum is non-ionic, meaning it carries no electrical charge. It thickens water and helps hold emulsions together, but it does not bind to hair in any useful way. Cosmetic-grade guar is native guar purified and specified for personal care, with lower microbial counts, controlled colour and consistent viscosity from lot to lot. Choose native or cosmetic-grade guar when the job is thickening, suspension or emulsion stability.
Cationic guar is made by reacting guar gum with a quaternary ammonium compound, which fixes a permanent positive charge onto the polymer. That charge is what allows it to deposit on hair, making it the most widely used natural-origin conditioning polymer in shampoo. Choose cationic guar (INCI: Guar Hydroxypropyltrimonium Chloride; CAS 65497-29-2) when you want detangling, softness, static control and silicone or active deposition from one ingredient.
Hydroxypropyl guar is a non-ionic modified guar with better clarity, salt tolerance and solubility than native guar, used as a thickener and suspending agent including in high-alcohol systems. Hydroxypropyl guar hydroxypropyltrimonium chloride carries both modifications, giving cationic conditioning alongside improved clarity and compatibility. It is the usual pick when a clear, well-conditioning shampoo is the target.
Guar gum performs five practical functions in a cosmetic formula: it thickens and controls rheology, suspends insoluble particles, stabilises emulsions, forms films, and in cationic form conditions hair. CosIng, the European Commission’s cosmetic ingredient database, lists Cyamopsis Tetragonoloba Gum’s functions as binding, emulsion stabilising, film forming, masking and viscosity controlling.
Cationic guar deposits on hair through complex coacervation with anionic surfactants, and the deposit forms mainly at the moment the shampoo is diluted with water during rinsing. Inside the bottle, the positively charged guar and the negatively charged surfactant sit together in solution. Rinsing changes that balance, and the polymer and surfactant separate out as a coacervate, a concentrated phase that lands on the hair. Because damaged and chemically treated hair carries more negative sites, the polymer goes where conditioning is most needed. Cosmetic science literature calls this dilution deposition.
Coacervate formation depends on charge density, the polymer-to-surfactant ratio, salt level, pH and temperature, which is why a small formula change can make or break conditioning performance.
The dose efficiency is the reason formulators keep choosing it. Manufacturer testing from Solvay published in Cosmetics & Toiletries reported that 0.1% cationic guar minimised wet-combing force where 0.3% polyquaternium-10 had originally been required. The same body of supplier work reported cationic guars depositing roughly 43–53% of a 1% dimethicone dose from an SLES/CAPB system, against 13.6% for polyquaternium-7 and 4.9% for polyquaternium-10. Treat those as manufacturer data rather than independent research.
Guar gum’s hydration and viscosity respond strongly to pH, salt and heat, and cationic guar adds its own acid-swelling requirement. Native guar holds up best around pH 5–7. Strong acids hydrolyse the polymer and cost you viscosity, and concentrated alkali also reduces it. Cationic guar is the opposite case, hydrating best near pH 4–5 before the formula is brought back up.
Salt is the standard viscosity lever in anionic surfactant shampoos. Viscosity climbs as sodium chloride is added, peaks, then falls. Overshooting that peak thins the product, and more salt will not bring it back, so run a salt curve on a small sample and stop at the top.
Above roughly 80°C, guar’s final viscosity drops slightly. Borate and borax crosslink guar into a gel at alkaline pH, which is a useful incompatibility to remember and design around in any liquid shampoo.
Yes. Guar gum is a natural polysaccharide and a food source for microbes, so any water-containing product made with it requires adequate broad-spectrum preservation. Without it, microbial and enzymatic activity breaks the polymer chains down. The first symptom is usually viscosity loss, followed by off odour, discolouration and visible spoilage. Unexplained thinning in the first days or weeks of storage is a classic sign of this, not a mixing error. Select a preservative validated for your product’s pH range, and confirm the system with a preservative efficacy (challenge) test before you sell.
A certificate of analysis tells you whether you are receiving cosmetic-quality material or repackaged food or industrial grade. These are the specification lines that matter to a shampoo maker.
| Specification | What it tells you | Typical target |
|---|---|---|
| Viscosity (1% solution, Brookfield, 2 hrs, 25°C) | Thickening power and grade consistency | Native often 3,500–5,000+ cps; cationic per TDS |
| Particle size / mesh | Hydration speed and lump risk | Commonly 200 mesh, ≥95% through |
| Moisture | Shelf stability | ≤12% |
| Protein / nitrogen | Purity, plus odour and colour risk | Protein ≤5–6% |
| Ash | Inorganic impurities | ≤1% |
| Acid-insoluble residue | Insolubles and clarity | ≤3% |
| pH (1% solution) | Formula compatibility | Native around 5.5–7; cationic per TDS |
| Microbial limits | Product safety | Total plate count, yeast and mould, absence of pathogens |
| Heavy metals | Safety and compliance | Lead, arsenic, cadmium, mercury within limits |
Viscosity figures are meaningless without their test conditions. A number quoted as “5,000 cps” tells you nothing unless the concentration, standing time, temperature and spindle speed come with it.
No thickener or conditioner wins on every criterion. Guar is inexpensive and hydrates in cold water. Xanthan is more tolerant of acid and salt and suspends particles better. HEC gives clarity across a very wide pH range. Carbomer builds clear high-viscosity gels but faces tightening EU microplastic rules. Salt is nearly free but only works in anionic systems and has a hard ceiling.
| Option | Strengths | Trade-offs |
|---|---|---|
| Native guar | Cheap, cold-hydrating, natural, high viscosity at low dose | Can be hazy; salt and pH sensitive; needs preservation |
| Xanthan gum | Acid, salt and freeze-thaw stable; strong suspension | Can feel slimy; off-white; costs more than guar |
| HEC | Very wide pH range, salt tolerant, clear | Semi-synthetic; no conditioning benefit |
| Carbomer | Crystal-clear high-viscosity gels | EU microplastic pressure; pH sensitive; needs neutralising |
| Cationic guar | Natural-origin conditioning plus some thickening; COSMOS-eligible | Requires pH and hydration control |
| Polyquaternium-7 / -10 | Reliable, predictable synthetic conditioners | Synthetic; lower silicone deposition; higher cost |
| Salt (NaCl) | Almost free, easy to dose | Anionic systems only; limited by the salt curve |
Cationic guar is the usual natural-origin replacement for polyquaternium-7 or -10, and it is COSMOS and Ecocert eligible where the synthetic polyquats are not. On cost, Solvay data published in Personal Care Magazine put the polyquaternium-10 selling price roughly 40% above a comparable cationic guar. Guar and xanthan also work synergistically, and a blend of the two can give higher viscosity than either gum alone at the same total dose. For a wider surfactant and conditioning-system comparison, see Best Surfactants for Shampoo in Pakistan 2026 – SLES, CAPB, SLS & More and SLS vs SLES: What’s the Difference in Shampoo?
Guar gum and its cationic derivative are well-established, low-concern cosmetic ingredients. Both were covered in the Cosmetic Ingredient Review Expert Panel’s Safety Assessment of Galactomannans as Used in Cosmetics, published in the International Journal of Toxicology in 2015, which concluded that these ingredients are safe in the present practices of use and concentration.
Guar gum is FDA GRAS for food use under 21 CFR 184.1339, carries the EU food additive code E412, and is listed in CosIng for cosmetic use. EFSA’s 2017 re-evaluation of E412 concluded that no numerical acceptable daily intake was needed for the general population. Both native and cationic guar are plant-derived, vegan and biodegradable, and reported skin sensitisation is rare.
Keep label language to function. Describe guar as a conditioning or thickening ingredient, and avoid medical or hair-growth claims, which are not supported and create regulatory exposure. Anyone with a known legume allergy should be directed to a qualified professional rather than reassured by a product page.
Nearly every guar problem traces back to one of four causes: hydration, pH, dose or preservation. This matrix maps the symptom to the fix.
| Problem | Likely cause | Fix |
|---|---|---|
| Lumps or fish-eyes | Powder added too fast, no pre-dispersion | Slurry in glycerin or PG, or sprinkle into a vortex; apply high shear |
| No viscosity build (cationic) | pH too high, boron not released | Lower pH to about 4–5 and mix around 15 minutes |
| Viscosity drops over days | Microbial or enzymatic degradation | Add and validate a broad-spectrum preservative |
| Hazy or cloudy product | Insolubles in native guar | Switch to HP guar or a cosmetic grade; filter the batch |
| Rough, heavy hair feel | Cationic guar over-dosed | Reduce to 0.1–0.3% |
| Batch-to-batch viscosity swings | Grade variation or food-grade substitution | Buy to a written spec and check the COA every lot |
| Gum layer or surface separation | Incomplete hydration, or cationic and anionic clash | Hydrate fully first; add amphoteric before anionic |
Pre-dispersing guar in glycerin or propylene glycol before adding it to the water phase is the standard fix for lumping, the same slurry technique used for other cold-water-dispersible gums.
Guar is grown in Pakistan, mainly in Sindh and Punjab, so the raw material is regionally available. The grade offered to you, however, is often food or industrial rather than cosmetic. Ask any supplier for four things before you buy: the INCI name, the CAS number, confirmation of cosmetic grade in writing, and a batch COA for the lot being shipped.
Confirm whether you are being quoted native guar or cationic guar, because both are commonly listed as “guar gum” and the price difference reflects two different materials. For a new brand, a small documented quantity of cosmetic-grade material is a better purchase than a cheap drum with no paperwork. Local cosmetic-grade pricing and lead times move with the season and the supplier.
Stexol Chemicals supplies cosmetic-grade raw materials for shampoo from 1 kg upward, which lets a new brand trial a formula before committing to bulk, browse the full shampoo raw materials range.
Store guar gum powder in a sealed, airtight container in a cool, dry place away from sunlight and humidity, where it typically keeps for 12–24 months. Guar is hygroscopic, so moisture is the main threat, causing clumping and loss of thickening power.
In humid Pakistani conditions, keep bags tightly closed between uses, handle the powder only with clean dry scoops, and consider a desiccant in the storage container. Discard any powder that has formed hard clumps, smells off or rancid, has discoloured, or no longer thickens to its usual viscosity.
Run this five-point check before you accept any guar shipment. It takes two minutes and prevents most of the failures listed above.
Is guar gum the same as cationic guar?
No. Guar gum is a non-ionic thickener. Cationic guar (guar hydroxypropyltrimonium chloride) is chemically modified to carry a positive charge, which makes it a hair-conditioning polymer.
Can guar gum thicken a shampoo on its own?
Native and hydroxypropyl guar can build viscosity, but most anionic shampoos are thickened mainly through surfactant choice and the salt curve. Cationic guar contributes some thickening alongside its conditioning role.
Why did my shampoo go thin after a few days?
The most common cause is microbial or enzymatic degradation of the guar due to inadequate preservation. Over-salting past the salt-curve peak is the second most common cause.
Does cationic guar cause build-up?
Moderately cationic guars condition without heavy build-up at normal doses. Over-dosing above roughly 0.5% is the usual reason hair feels coated or rough.
Is guar gum vegan and natural?
Yes. Guar gum is plant-derived, vegan and biodegradable, and cationic guar is COSMOS and Ecocert eligible for natural formulations.
Decide first whether you need thickening or conditioning, then buy the grade that matches: native or cosmetic-grade guar for viscosity and suspension, cationic guar for conditioning. Run the Stexol COA-First Guar Check on every incoming lot. If you are starting out, order a small cosmetic-grade quantity or a Shampoo Starter Kit and prove the formula on a trial batch before you scale to bulk, reach out via ChemAssist or contact us to get started.
