How to vet a cosmetics OEM factory before you send a deposit
Most private-label problems are visible before the deposit, if you ask for the right four documents and walk the filling room once.
28 October 2026 · Supplier vetting
Ask for the production licence, not the brochure
A cosmetics factory in China operates under a production licence tied to a specific site and a specific scope. Ask for the licence number and check that the address on it matches the address on the quotation. A trading company with a factory introduction is not the same entity as the site that will fill your batch, and the difference matters when something goes wrong.
The same logic applies to cleanroom claims. 'GMPC workshop' on a website means little; the useful question is which room your product will be filled in, and what class that room is. A leave-on serum and a bar of soap do not need the same environment, and a factory that answers precisely is usually a factory that knows its own process.
Sample first, and sample the packaging too
A sample that arrives in unlabelled PET tells you about texture and nothing about the project. Ask for the sample in the intended pack, or at least in a pack of the same material and neck size. Compatibility failures, from pump seizure to label wrinkling, show up at the pack stage.
Sampling speed is also a signal. A stock formula should be dispatched in days, not weeks. If the first sample takes a month for a formula the factory claims to hold on file, the schedule will not improve on the bulk order.
Read the stability and microbiological records
Stability data is the difference between a product that survives a container in summer and one that separates on a retailer's shelf. Ask for accelerated and real-time results on the specific formula and pack, not on a similar product. Microbiological testing should cover both bulk and finished goods, plus environmental monitoring in the filling room.
If a supplier cannot produce these records for the exact combination you are buying, you are effectively funding the testing yourself, and the launch date is a guess.
Match documentation to the destination market
Ingredient naming, label language, claim wording and notification requirements are set by the country where the product is sold, not where it is made. A supplier who asks 'which country are you selling in?' before quoting is doing the right thing. One who quotes immediately without asking is quoting a product that may not clear customs.
Claims deserve particular care. Brightening, whitening, lightening and depigmenting are different regulatory categories in most markets, and a scalp product that promises hair growth is usually a drug, not a cosmetic. The cheapest moment to fix a claim is before the carton is printed.
What a plant visit should tell you
Walk the route your product will take: raw material staging, compounding, filling, labelling, packing. Look for documented batch records at the line, not in an office folder. Check that operators are gowned and that the airlock is actually used.
One question separates factories that manage quality from factories that market it: ask to see a retention sample from a batch shipped a year ago. A factory with a working retention system can produce it in minutes.