How to start a peptide company: what to test before your first batch ships

Starting a peptide company: the testing part

If you are working out how to start a peptide company, testing is the part you control. Before your first batch ships, test the manufacturer’s samples, then test random vials from the finished lot before you pay the balance. Print the batch ID on every vial, publish one report per lot that customers can check at the lab, and test every new lot.

The rules for selling peptides depend on your market. This guide covers testing only. Follow the rules of your market and your courier.

White label and private label peptides: what you are buying

White label means a manufacturer’s standard product with your label on it. Private label means the manufacturer makes it to your specification: strength, fill, counter-ion, vial, cap and label. Many new brands buy either kind from manufacturers in China.

Either way, the brand on the vial is yours, and buyers judge it by what is inside. Finnrick publishes results on samples that buyers send in and rates each seller and peptide pair; a seller’s own COAs do not drive that rating (Finnrick). Your product can be tested in public whether or not you test it first.

White label carries one extra risk. If many brands show the same factory report, rating sites can flag it. Disclosed Labs puts 15% of a vendor’s grade on forgery signals, such as one lot number used by several vendors (Disclosed Labs). See white-label COAs.

The pre-launch testing checklist

#	Step	When
1	Write a product specification	Before you contact factories
2	Vet the manufacturer’s documents	Before the first order
3	Test pre-production samples	Before the first order
4	Test the finished lot	Before the balance is paid
5	Compare the factory COA with the outside result	When results arrive
6	Print the batch ID on every vial	At filling
7	Publish one report per lot	At launch
8	Never reuse a report	Always
9	Add a second lab	As you grow
10	Test every new lot	Every reorder

1. Write a specification. Name the peptide, the mg per vial and its basis (net peptide or total powder), the purity limit, the counter-ion (TFA or acetate), the fill tolerance and any endotoxin limit. The EMA peptide guideline expresses assay on a counter-ion-free, anhydrous basis, which is a sound default for your own spec (EMA).

2. Vet the documents. Ask for a lot-specific COA with chromatogram and mass spectrum, the release specification and retained samples. Our manufacturer checklist lists twelve checks.

3. Test the samples. Identity by LC-MS, purity by HPLC and content per vial, with the label claim withheld.

4. Test the finished lot before the balance. Have random, sealed vials picked from the production lot. Add vial-to-vial consistency, endotoxin and Sterility (USP <71>, 14 days) where they apply. Sterility incubates for at least 14 days, so send those vials first. The method is in pre-shipment testing.

5. Compare on the same basis. A factory that reports total powder weight will show more mg than a lab that reports net peptide. Check the basis before you call either number wrong.

6. Print the batch ID on the vial. Finnrick’s labelling score gives 2 for a batch ID printed on the vial, 1 for one on an insert and 0 for one on a website only (Finnrick).

7. Publish one report per lot. PeptideTrust scores brands on whether the lab is named, the report can be checked at its source, reports are per batch and recent, buyers can see them before purchase with no account, and sterility and endotoxin are published (PeptideTrust).

8. Never reuse a report. PeptideBenchmark flags a report reused across compounds, an identical file across vendors and a lot shared across vendors (PeptideBenchmark). More in reused COAs.

9. Add a second lab. Merit Verified gives a vendor 8 points for COAs from one lab, 14 for two and 20 for three or more (Merit Verified).

10. Test every new lot. A reorder from the same factory is a new batch. Keep sealed vials from each lot and log every result.

What rating sites will check about a new brand

Site	Rule that affects a new brand
Finnrick	Default standard (Purity Focus): purity at least 99.5% and content within ±35% of the label. Overfill fails as well as underfill
Disclosed Labs	40% of the grade is safety-panel coverage; 15% is whether the report can be confirmed with the lab
Peptigrity	No in-house vendor testing. Content of 95% to 110% of the label is “in line”; over 110% is never shown as good
PeptideTrust	Named lab, report verifiable at source, per batch, recent, visible before purchase
Merit Verified	Labs owned by a vendor are flagged and cannot earn a passing tier

Sources: Finnrick, Disclosed Labs, Peptigrity, PeptideTrust, Merit Verified.

Two rules surprise new brands. Overfilling to look generous fails Finnrick’s standard. And about 40% of the certificates on Peptigrity showed more than 110% of the label in September 2026; Peptigrity notes that reporting total powder weight inflates the figure (Peptigrity). State the basis on every report.

Finnrick scores test results. Several of the sellers at the top of Finnrick’s per-peptide leaderboards are direct sellers based in China (Finnrick data). Results on each lot decide the score. The vendor side of this is in batch testing for vendors.

What HK Analytical does for new peptide brands

Our lab is in Hong Kong. Samples from mainland China reach it by cross-border courier; declare them accurately, follow your courier’s rules, and we send the sample form on request. One order covers any mix of the tests we offer. Results within days of receipt. Sterility (USP <71>, 14 days) is the one test that takes 14 days, because the method incubates for 14 days. Every number comes with its raw data. Each report is a signed record with a private link your customers can check on /verify, and reports on your own products say “Ordered by the seller or maker”. See the example report, batch testing for brands or ask for a quote.