Glabridin Grades Explained: How Buyers Should Compare 40%, 90%, 98% and Other Supplier Specifications

Image credit: Glycyrrhiza glabra inflorescence by Pharaoh han, licensed under CC BY-SA 3.0.

Quick Answer

Glabridin grades such as 40%, 90% and 98% describe the stated assay of Glabridin in a commercial material. They do not create a universal quality ladder. A higher number does not establish that two products use comparable analytical methods, contain the same non-Glabridin components, behave alike in a formula or offer the lowest effective cost.

Compare five elements before price: exact identity, assay and method, matrix or carrier, commercial format, and cost-in-use. A 98% raw powder may suit a project that already has a workable incorporation process. A lower-assay delivery system may be preferable when it solves a verified solubility or handling problem. Treat assay as one specification field, not the complete product definition.

What Is the Difference Between Glabridin 40%, 90% and 98%?

The percentage is the supplier's stated Glabridin fraction. Public supplier pages reviewed in September 2026 showed 40%, 90%, 98% and 99% offers, sometimes alongside different delivery formats. This is a dated market observation, not evidence that these percentages are formal industry-wide grades.

Two products with the same percentage can still differ in source material, analytical method, extract matrix, carrier, physical form and documentation. Products with different percentages may also be designed for different formulation systems rather than representing low-, medium- and high-quality versions of one interchangeable material.

When reviewing a quote, place the assay beside these questions:

• Do the product name, CAS, botanical source, code and specification identify the same material?
• Does a current batch COA support the stated grade, and what method or reporting basis was used?
• What forms the non-Glabridin fraction?
• Is the offer a raw powder, standardized extract or formulated delivery system?
• What is the delivered and qualified cost per gram of active?

Compare complete specifications before deciding that a higher percentage is better.

Is Glabridin the Same as Licorice Root Extract?

No. Glabridin is a defined compound with CAS 59870-68-7, molecular formula C20H20O4 and molecular weight of about 324.4 g/mol.[1] Scientific literature identifies it as a characteristic prenylated isoflavan associated with Glycyrrhiza glabra roots.[2] Glycyrrhiza glabra root extract is a broader botanical material, not a single compound.[7]

A supplier may therefore offer a standardized licorice extract containing Glabridin, a higher-assay Glabridin material, or a delivery system containing Glabridin and other components. Similar marketing language does not make them interchangeable. Before comparing assay or price, reconcile product name, CAS where applicable, botanical source, product code, grade, specification and batch COA.

If a page labels a product Glabridin but shows an inconsistent identifier, stop and request clarification. A mismatch is a document-control warning, not proof of fraud; it simply means the offer is not ready for like-for-like comparison.

What Does “98% HPLC Glabridin” Mean?

“98% HPLC” combines a reported assay with an analytical approach. It does not mean that every supplier used an identical method or that two 98% results are automatically equivalent. Peer-reviewed studies support chromatographic quantification of Glabridin, including a validated RP-HPLC method for licorice-containing materials and validated HPLC/HPTLC methods for Glycyrrhiza glabra extracts.[3][4] Those studies also show why “HPLC tested” is incomplete: legitimate methods can use different columns, mobile phases, detection settings, sample preparation, reference standards and calculation bases.

Ask for the current lot result, the supplier's specification, the method or method reference where available, and whether the result is reported as-is or on another basis. Reference-standard information may also matter to your QC system. The goal is not to reproduce the supplier's laboratory work; it is to determine whether the percentage is sufficiently defined for comparison and incoming control. Keep the acceptance limit and the batch result in separate fields. A lot that tests above 98% does not change the standing specification or predict every future lot.

What Makes Up the Rest of a 40% Glabridin Product?

A 40% assay identifies the reported Glabridin fraction but not the remaining 60%. Depending on the exact product, the remainder may be a standardized botanical matrix, a declared carrier, a complexing system or other disclosed components. Do not infer its composition from the assay alone. The non-Glabridin fraction can affect color, handling, required loading, solubility, labeling and cost-in-use. A 40% standardized extract and a 40% delivery system can share a headline percentage while behaving very differently.

Request the specification and TDS for the exact grade, then ask whether the product is an extract or more purified material, whether a carrier or complex is present, and whether the composition information applies to the quoted code and lot. Treat “40%” as an assay statement, not a full composition statement.

Is Glabridin Water Soluble?

Free Glabridin has low aqueous solubility. Research into cyclodextrin complexation and other delivery approaches exists because water compatibility is a practical limitation.[5] A 2025 study described Glabridin as insoluble in water and reported crystallization when a DMSO solution was introduced into an aqueous cell-culture medium.[6]

Commercial “water-soluble Glabridin” may therefore be a modified, complexed or formulated system rather than free Glabridin becoming intrinsically water-soluble. An HP-beta-cyclodextrin inclusion complex improved aqueous solubility under specific experimental conditions,[5] but that result does not establish that every commercial product uses the same carrier, active loading or process.

For a water-compatible offer, verify Glabridin assay, complete commercial composition, carrier or complexing system, physical form, test conditions, recommended incorporation method and stability data relevant to your formula. Do not compare such a system directly with 98% raw powder by assay alone. Compare each within the format category that solves the actual formulation problem.

How Should Buyers Compare Glabridin Prices?

Normalize product identity, quantity, assay and format before comparing displayed prices. Marketplace values can refer to different grades, MOQs, package sizes or delivery systems and should be treated as discovery signals until the supplier confirms a written quote.

For like-for-like materials, use two steps:

1. Active grams per kg = 1,000 × assay fraction.
2. Cost per gram active = quoted price per kg ÷ active grams per kg.

The worked examples show why assay alone does not determine the economic winner. A higher price per kilogram may still produce a lower active cost, but that result can reverse when the quote changes. Then add MOQ, freight, duties, packaging, samples, incoming testing, documentation work, required formula loading, process changes, lead time and rejection risk. A lower $/kg offer can cost more after qualification or formulation, while a delivery system with lower assay may reduce development work. Compare delivered and qualified cost, not the marketplace headline.

How Do You Read a Glabridin COA?

Use the COA to verify the exact quoted grade and lot. Check product identity and code, lot number, standing specification, actual assay result, analytical method or reference where provided, appearance, grade-specific quality fields, relevant dates and release status. The COA should agree with the specification, TDS, SDS, label and quote.

If a supplier markets several grades on one page, do not assume one generic COA covers all of them. Ask for the certificate matching the sample or available shipment lot. Keep specification and result separate: the first defines the release requirement, while the second describes one batch.

A supplier COA is not independent verification. Incoming QC or third-party testing may still be appropriate based on purchase value, formulation risk, quality requirements and regulatory exposure. The document's purpose is to connect a defined material and lot to interpretable results, not to prove every future shipment or finished-formula outcome.

What Should You Check Before Choosing a Supplier?

Pause qualification when identity fields conflict, several grades share generic documentation, “HPLC tested” lacks a lot result, or a water-soluble offer does not disclose its format or carrier. Ambiguous price units, MOQ, package size, unsupported certification claims and a COA that does not match the quoted code also require follow-up. These are due-diligence triggers, not accusations.

MOQ should be separated into sample quantity, pilot order, commercial minimum and the quantities at which price or packaging changes. There is no universal Glabridin MOQ; published values can change with grade, package and supplier policy. Date and attribute any public offer, then request current commercial terms in writing.

Supplier qualification should connect the legal entity, manufacturing or distribution role, quality certificates and scope, sample, COA and quote to the same commercial grade. A successful sample is useful, but repeat supply also requires change notification, batch consistency and a defined complaint or deviation process.

What Should a Glabridin RFQ Include?

Send every candidate the same brief so missing information becomes visible. Request:

• exact identity, product code, CAS and botanical source where relevant;
• acceptable assay range and the required raw, extract or delivery-system format;
• carrier or matrix disclosure and intended formulation system;
• current specification, lot COA, TDS, SDS and method reference where needed;
• a traceable sample with its lot-matched COA;
• sample, pilot and expected commercial quantities;
• MOQ, price tiers, package, lead time, Incoterm, payment terms and quote validity;
• storage, shelf life, certificate scope, manufacturing role and change-notification procedure.

“What is your best price?” does not create comparable offers. A standardized RFQ does, because assay, format, evidence and commercial terms can be reviewed in one table before samples or negotiations consume more time. Before requesting quotes, define the acceptable assay range, required format and formulation system, sample and scale quantities, and minimum documentation package. Apply those same requirements to every supplier. This keeps the decision focused on like-for-like procurement evidence rather than changing marketplace headlines.

Current Glabridin Sourcing Link

A Like-for-Like Glabridin Comparison Workflow

Start with an identity gate. Exclude any offer whose product name, CAS, botanical source, code or commercial format cannot be reconciled. Next, place the standing assay specification beside the current lot result and record the method or reporting basis; do not use a marketplace headline as either value.

Then classify each candidate as a raw high-assay material, standardized extract or formulated delivery system. Record the disclosed matrix or carrier so products with different functions are not forced into one purity ranking. Within each valid format group, calculate stated active cost and add MOQ, packaging, freight, testing, processing and documentation costs.

Only after that paper review should a supplier advance to sample testing. Match the sample to its COA, test incorporation in the intended base, observe color and precipitation, and define the incoming checks required for later lots. Record unresolved claims as unresolved rather than filling gaps with assumptions. This sequence matters because it prevents an attractive assay or price from bypassing identity and formulation checks. It also preserves useful options: a 40% system is not rejected merely for being lower assay, and a 98% powder is not rewarded until its analytical and practical fit are demonstrated.

Which Glabridin Grade Should You Choose?

Choose by project scenario rather than by a universal grade ranking.

Before ordering, confirm the seller, exact grade, assay basis, commercial format, current specification, lot-specific COA, MOQ and delivery terms. The marketplace link is a sourcing starting point, not a supplier approval or permanent price recommendation.

Ingredexa Sourcing Principle

A higher assay, lower display price or stronger marketing claim is not a standalone quality signal. The defensible choice is the exact grade whose identity, analytical evidence, composition, formulation behavior, documentation and total sourcing cost match the project. Resolve those questions before ranking suppliers or placing an order.

References

1. PubChem. Glabridin, CID 124052 / CAS 59870-68-7. https://pubchem.ncbi.nlm.nih.gov/compound/59870-68-7
2. Simmler C, Pauli GF, Chen SN. Phytochemistry and Biological Properties of Glabridin. Fitoterapia. 2013. https://pmc.ncbi.nlm.nih.gov/articles/PMC3795865/
3. Kamal YT, et al. Rapid RP-HPLC method for the quantification of glabridin in crude drug and in polyherbal formulation. Journal of Chromatographic Science. 2012;50(9):779–784. PMID: 22661460. https://pubmed.ncbi.nlm.nih.gov/22661460/
4. Viswanathan V, Mukne AP. Development and Validation of HPLC and HPTLC Methods for Estimation of Glabridin in Extracts of Glycyrrhiza glabra. J AOAC Int. 2016;99(2):374–379. PMID: 27103104. https://pubmed.ncbi.nlm.nih.gov/27103104/
5. Wei Y, et al. Characterization of glabridin/hydroxypropyl-beta-cyclodextrin inclusion complex with robust solubility and enhanced bioactivity. Carbohydrate Polymers. 2017;159:152–160. PMID: 28038744. https://pubmed.ncbi.nlm.nih.gov/28038744/
6. Liu H, et al. Overestimated cytotoxicity and underestimated whitening efficacy of glabridin: A result of its poor solubility in DMSO. PLoS One. 2025;20(6):e0325247. PMID: 40478921. https://pubmed.ncbi.nlm.nih.gov/40478921/
7. COSMILE Europe. GLYCYRRHIZA GLABRA ROOT EXTRACT. Cosmetic ingredient reference describing a root-derived extract of Glycyrrhiza glabra. https://cosmileeurope.eu/inci/detail/6154/glycyrrhiza-glabra-root-extract/