Sourcing Excipients from China: 10 Things to Verify Before You Qualify a Supplier
China holds a dominant share of global production capacity for erythritol, xylitol, maltitol, and maltodextrin. Most of that capacity, however, is listed on B2B platforms as generic chemical commodity, without the water activity, CRH, or compendial data a formulation team actually needs to evaluate fit. Sourcing excipients from China well means closing that documentation gap yourself, upfront, rather than discovering it mid-qualification. Here are ten things worth verifying first.
1. CDE excipient registration status
Confirm the CDE (China Center for Drug Evaluation) excipient registration number, and specifically whether status is “A” — meaning it has passed associated review — rather than simply confirming that a registration number exists at all. A registration number alone doesn’t tell you the current review status.
2. US DMF number and type
If the material will be used in a US-regulated product, confirm whether a Drug Master File is filed for that specific grade, and which type. The FDA’s DMF resource pages are a useful reference for understanding what a DMF submission does and doesn’t confirm about a supplier’s material.
3. Compendial compliance, grade by grade
Confirm which compendial standard — ChP, USP-NF, EP, JP — a specific grade is manufactured and tested against, with current CoA as evidence, rather than assuming a manufacturer’s full catalog is uniformly multi-compendial. Many manufacturers produce primarily to ChP specification, with USP-NF or EP compliance available on select grades only.
4. Separate food-grade and pharma-grade production lines
Ask directly whether food-grade and pharma-grade material share equipment or run on separate lines. This affects both quality consistency and audit readiness, and it’s not always obvious from a product listing alone.
5. Quality certifications appropriate to your market
For pharma-grade material, EXCiPACT or IPEC-PQG GMP certification is the relevant benchmark. For food-grade material, FSSC 22000, ISO 22000, or BRC certification applies instead. Kosher or Halal certification matters if it’s relevant to your target market specifically — confirm rather than assume either is automatically available.
6. Water activity, LOD, and CRH — with method disclosed
Ask for Aw at 25°C with the equilibrium method and instrument disclosed, alongside LOD and CRH. This is the data most commonly missing from standard Chinese excipient documentation, and it’s the data that matters most for anyone sourcing excipients from China for a moisture-sensitive or probiotic formulation. See Water Activity Excipients: 7 Facts Formulators Get Wrong About Moisture for more on why this specific data point matters.
7. Physical and processing characteristics
Particle size distribution (D10/D50/D90), bulk and tapped density, and Carr index or Hausner ratio all affect whether a material will actually perform in your process — direct compression, dry granulation, or wet granulation each have different tolerances for these characteristics.
8. Production capacity and vertical integration
Confirm whether the manufacturer is vertically integrated — for example, corn starch through to finished sugar alcohol — or an outsourced processor sourcing intermediate material from a third party. This affects both pricing stability and supply continuity during raw material shortages.
9. MOQ, packaging, and lead time
Confirm minimum order quantity, available packaging formats, and realistic lead time — including whether the manufacturer accepts OEM or custom particle size requests, which matters if your process has specific flow or compressibility requirements.
10. Export track record to your specific target market
A manufacturer with strong export documentation to one region doesn’t automatically have equivalent experience or compliance familiarity with another. Confirm export history specifically to your target market, not just export capability in general.
Why this matters more than it seems
A supplier that can’t produce Aw data on request, or is vague about CDE registration status, isn’t necessarily a bad supplier — it means you’re the one absorbing the qualification risk if you proceed anyway. Verifying these ten points upfront, before requesting samples, generally saves a full qualification cycle compared to discovering gaps later.
Esubio pre-verifies this checklist for every manufacturer we work with and makes documentation available before you request a sample. Browse our Low Water Activity Excipients range or request our supplier verification checklist directly.
References
- S. FDA, “Drug Master Files (DMFs)” — https://www.fda.gov/drugs/forms-submission-requirements/drug-master-files-dmfs
- USP General Chapter <1112>, Application of Water Activity Determination to Nonsterile Pharmaceutical Products — https://doi.usp.org/USPNF/USPNF_M402_01_01.html
- New Zealand Ministry for Primary Industries, “Food Additives and Preservatives” — https://www.mpi.govt.nz/food-safety-home/food-additives-preservatives