What dipotassium glycyrrhizate is

Dipotassium glycyrrhizate (INCI: DIPOTASSIUM GLYCYRRHIZATE) is the dipotassium salt of glycyrrhizic acid (glycyrrhizin), and the reason for turning the acid into its potassium salt is direct: to raise water solubility. Glycyrrhizic acid itself is poorly soluble in cold water, whereas the potassium salt dissolves far better, which is what makes it usable in aqueous systems. It comes from the roots and rhizomes of liquorice, a legume, with the common botanical sources being Glycyrrhiza uralensis, Glycyrrhiza glabra and Glycyrrhiza inflata. It is a single compound rather than an extract, with the formula C42H60K2O16 and a molecular weight near 899 Da, and purity can be quantified precisely by HPLC — a sharp contrast with most botanical extracts, and the reason its price is high yet predictable.

One confusion that errors out frequently during purchasing must be settled first: dipotassium glycyrrhizate ≠ liquorice root extract (Glycyrrhiza Glabra Root Extract) ≠ generic liquorice extract. The latter two are botanical extracts sold on total extract weight, containing flavonoids (such as glabridin), polysaccharides and other components alongside glycyrrhizic acid — cheaper, with widely varying active concentration. Dipotassium glycyrrhizate is a purified single compound, far more expensive per unit but predictable. The unit price for nominally "liquorice material" can differ by an order of magnitude between the two systems. The practical advice is unambiguous: state the INCI name in every enquiry and require the declared glycyrrhizic acid (or dipotassium glycyrrhizate) content; if a supplier quotes only "liquorice extract XX%", that quote cannot be compared against others.

Its physico-chemical profile has more points worth watching than expected: a white to off-white powder, freely soluble in water, soluble in aqueous ethanol and glycerin, practically insoluble in oils; aqueous solutions sit from weakly acidic to neutral; sweetness several tens of times that of sucrose; measurable surface activity, with foaming at higher concentration in water; solutions generally clear to pale yellow, far lighter in colour than most botanical extracts. Two properties bear directly on formulation. First, its surface activity — as a triterpene saponin it lowers interfacial tension and foams like other saponins, so foaming needs managing in water-based serums and gels. Second, behaviour under acidic conditions — at too low a pH, dipotassium glycyrrhizate can convert back to poorly soluble glycyrrhizic acid and precipitate, the most easily overlooked technical constraint of this ingredient. Finally, the high sweetness means it sometimes participates in how the formula reads on odour and even mouthfeel positioning, which needs assessing where odour is tightly controlled.

Ingredient fact box

How it works, plainly

Its mechanism can be split along three lines: what it corresponds to in biochemical language matters less than the three roles it actually carries in cosmetics — summarised here as the soothing line, the hydration-maintenance line and the system line. State this from the outset again: this is a mechanism discussion at the cosmetic application level, not a medical explanation and not an efficacy promise.

• Line one: soothing. This is the layer liquorice root has been used for over millennia, expressed in modern cosmetic terms as helping improve how discomfort from external stress reads, and supporting a formula's gentleness. One vocabulary boundary deserves repeating: "soothing", "eases discomfort" and "supports formula gentleness" are acceptable; "anti-inflammatory", "reduces inflammation" and "inhibits inflammatory factors" are not. The latter belongs to quasi-drug efficacy in Japan and elsewhere, and in most markets it triggers a medicinal-claim assessment in a cosmetic context. This is not pedantry — it is the most common way this category crosses the line.
• Line two: hydration maintenance. A hypothesis discussed fairly widely in the literature is that glycyrrhizate salts may affect hyaluronidase activity, thereby helping sustain the skin's own hyaluronic acid level. Practically this means it is not only a present-moment calm; by slowing hyaluronic acid breakdown it may keep a plumper, more hydrated look around the eyes for longer. Be honest: this is a mechanistic hypothesis, and in cosmetic language it may only be stated as "helps improve the look of hydration and plumpness" — not as a biochemical assertion. To check it, search PubMed for "glycyrrhizic acid hyaluronidase" and "dipotassium glycyrrhizate".
• Line three: the system (routinely underestimated). Its surface activity helps the essence spread and helps patches conform; its pale colour admits it into colour-sensitive products; and its high sweetness plus faint odour means it is not always invisible. This line usually ranks below the first two, but in clear gels and pale fragrance-free formulas it often decides whether the spend is worth it.
• An honest note on evidence strength. Glycyrrhizic acid has plenty of in-vitro and animal work, but human, eye-area-specific controlled studies at cosmetic use levels are limited, and most endpoints are biomarkers rather than appearance. No single study may be presented as proof, and conclusions should stay cautious — much of the evidence remains subjective sensation rather than objective measurement.
• Where it belongs in the formula. Dipotassium glycyrrhizate is best placed as the lead among supporting actors: it rarely carries the headline claim, yet it decides whether the product can be used daily or is abandoned by day three. The common approach is to build a soothing base layer with Centella extract, panthenol and allantoin, letting the headline actives — niacinamide, tranexamic acid, retinol — work on top; in tolerance-managed categories such as retinol eye formulas, that soothing layer is close to mandatory (see our retinol eye care guide at ingredient.html?s=retinol).

A blunt note for sourcing: dipotassium glycyrrhizate will not be the hero active on your product page, but it is exactly the kind of ingredient that holds repeat purchase up — especially where tolerance is low, daily use is expected, or the headline active itself carries irritation risk (retinol, acids, high-dose brighteners). If the budget allows only one soothing active and the product sells across several markets, its documentation and purity are generally easier to control than an extract, which makes it the lower-hassle choice. But remember the unit price is high: settle the quoting basis before discussing how much to add.

Which formats fit dipotassium glycyrrhizate best?

Use level and formulation notes (verify by bench trial)

Common reference level: dipotassium glycyrrhizate commonly sits at ≈0.1%–1% in skin-care formulas, with a substantial share of products landing in the 0.1%–0.5% band. The economics here are unusual: this is the classic low-use, high-unit-price material, so the dose is a balance between cost and in-use experience rather than a case of "fill it up for more effect". One basis point belongs in every document: as a single compound, its use level is the compound itself; but when supplied as liquorice root extract, it must be converted against the declared glycyrrhizic acid content — the two differ entirely across COA, label and formula documents. Beware the opposite extreme too: compressing the dose below the level where it is felt turns the whole soothing-layer investment into a sunk cost. The actual level is set on the bench by format, compatibility, target-market rules and stability data, converted against the assay on the supplier COA.

• The pH window is constraint #1. Keep it at 5.5–7.0. At too low a pH, dipotassium glycyrrhizate can convert back into poorly soluble glycyrrhizic acid and precipitate, showing up as haze, sediment or flocculation on standing. Avoid building it into high-dose low-pH acid systems; where combination is unavoidable, separate the format, adjust pH or run a dedicated precipitation check.
• Foaming is constraint #2. As a triterpene saponin it carries the same surface activity as escin, covered in our guide at ingredient.html?s=escin. Emulsified systems suppress foaming naturally; water-based serums and gels need dedicated assessment, with particular care for high dosing and pump-type packs.
• Processing. Add and fully dissolve in the water phase below 50–60 °C, avoiding prolonged heat, and confirm the solution is clear before charging. Verify complexing where cationic polymers are present.
• High sweetness, faint odour. Several tens of times sweeter than sucrose, with a light characteristic note. Assess maskability first in fragrance-free products or those where the perfume must lead — routinely overlooked until the sample arrives.
• Cost trade-off above all. Given the unit price, run a blind skin-feel comparison of two doses (say 0.2% and 0.5%) early in the project and let results set the ratio rather than defaulting to the supplier's recommended level — this step usually liberates a meaningful material cost.
• Stability protocol. 40 °C for 3 months plus freeze–thaw, releasing against glycyrrhizic acid retention (HPLC), pH drift, visible precipitation and colour change.
• Label and claim review. Before launch, a regulatory adviser must confirm the usable boundary of soothing copy per market — especially the word "anti-inflammatory", which is unavailable to cosmetics in several markets.

The figures above are common reference levels for eye care formulas; the actual use level is set by the formulation engineer based on dosage form, compatibility and target-market rules. Permitted use conditions, limits and labelling requirements differ by market — complete a compliance review for each destination before shipment. All descriptions here are general cosmetic applications and appearance or skin-feel statements, not medical advice or efficacy guarantees.

Compliance and market notes (verify per target market)

• China: first verify the listing status and historical maximum use level of dipotassium glycyrrhizate in the Inventory of Existing Cosmetic Ingredients in China (2021 edition) (per the latest NMPA announcement). Note that the inventory contains several near-identical liquorice entries (extract versus glycyrrhizate salt) that differ in basis; check each against the actual INCI being used and never assume equivalence. Where the inventory sets a historical maximum use level, work to that limit and keep it on file.
• Japan (the single most important point in this article): glycyrrhizic acid and its salts have long been handled in Japan as quasi-drug anti-inflammatory actives. Which means: if the product sells as a cosmetic, wording such as "anti-inflammatory" or "reduces inflammation" may never be carried over — across several markets that reads as a drug or quasi-drug claim. It also signals something else: regulators have taken this ingredient's claim boundary seriously, so brands have even less reason to test it in copy. Confirm the current list with a regulatory adviser per target market.
• EU (EC) No 1223/2009: declare the ingredient accurately in the CPNP notification, PIF and CPSR and complete the safety assessment; claims must meet the (EU) No 655/2013 common criteria. Soothing claims are similarly sensitive in the European context — "soothing" is fine, anything referencing inflammation is not.
• US MoCRA (2022): facility registration, product listing, safety substantiation, adverse-event reporting and record-keeping apply, with labelling under the FD&C Act and relevant 21 CFR provisions. Cosmetic ingredients and finished products generally do not undergo pre-market approval — never write "FDA approved".
• Claim red lines (all markets — strictest here): never use medical or pharmacological wording such as "anti-inflammatory", "reduces inflammation", "inhibits inflammatory factors", or "eliminates allergy"; nor "calms itching" or "treats dermatitis" style statements. On the Chinese site use appearance, skin-feel and usage-scenario wording such as "帮助缓和眼周不适感", "Support配方的温和性", "提升眼周舒适感" and "适合低耐受眼周日常护理".
• Recommended action: at project kick-off, give your regulatory adviser five items — INCI name (extract or glycyrrhizate salt), use level and basis, dosage form, target-country list and proposed soothing copy — for one upfront review. Require legal sign-off line by line on soothing copy: this is where "anti-inflammatory" most easily slips in.

Ingredient pairings

• Dipotassium glycyrrhizate + Centella extract + panthenol: the most robust of the soothing trios. Centella supplies multi-component support, panthenol softens and hydrates, and glycyrrhizate holds up the overall gentleness; their price tiers complement each other, making this standard for low-tolerance eye lines. For the pathway see our Centella asiatica guide (ingredient.html?s=centella-asiatica).
• Dipotassium glycyrrhizate + caffeine: a puffiness-look plus soothing combination. Caffeine carries the morning-fatigue story while glycyrrhizate keeps the product usable daily — well suited where the base formula is more stimulating.
• Dipotassium glycyrrhizate + retinol: the classic tolerance-management structure. Retinol eye creams almost always need a soothing base layer; the value is not additive efficacy but letting the headline active be used consistently enough to matter.
• Dipotassium glycyrrhizate + tranexamic acid / niacinamide: gentling partner for brightening lines. Making a high-activity system usable tends to win more often than making it stronger — which is why these two usually travel together.
• Dipotassium glycyrrhizate + sodium hyaluronate + allantoin: hydration maintenance plus soothing plus moisturising — the usual way to make practical use of the hyaluronidase hypothesis, suited to dry-feel daily eye lines.
• Use with care: check precipitation carefully against low-pH high-dose acid systems; verify complexing with cationic polymers and cationic surfactants; manage foaming in water-based high-dose systems; assess solubility under a high electrolyte load. Most importantly, do not compress the soothing layer until it is decorative — sunk cost is dearer than visible cost.

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