SeqLine Bio · Peptide manufacturer China
Peptide manufacturer · Guangzhou, China
A peptide manufacturer in China you can check before you order.
SeqLine Bio makes research peptides in Science City, Huangpu District, Guangzhou, and sells direct to B2B buyers. This page covers one question: how to confirm that the company quoting you is the company making your lot.
What runs on our line
Five steps, one site.
Every step from synthesis to the packed vial happens in our Guangzhou facility. We supply raw peptide powder and lyophilized vials, including GLP-1 research peptides such as tirzepatide, retatrutide and cagrilintide. The full list is in the catalog.
| Synthesis | Peptide made to the quoted sequence |
|---|---|
| Purification | Purified to the release specification, NLT 98.0% by HPLC |
| Lyophilization | Freeze-dried as powder or in glass vials |
| QC testing | HPLC purity and MS molecular-weight identity for each lot |
| Packaging | Neutral label by default; your own label from 100 kits |
How to check us
Four checks that separate a manufacturer from a reseller.
- Read the quotationIt names the contracting entity, the payee, the production site and the QC that releases your lot. They should match what you pay and what you receive.
- Find the lot in the COA libraryEvery published lot has a public COA with lot number, HPLC purity and MS identity. Open the COA library.
- Check the company recordAddress, entity and contact details are on the company fact sheet.
- Test a sampleOrder one kit (10 vials) and test it in a lab you choose. A confirmed quality issue is replaced or refunded under our quality policy.
More detail: Manufacturer vs reseller · How to verify a peptide supplier · Supplier red flags
Next step
Send your compound list.
Include compound, strength, quantity, format and destination. We reply within 4 hours during business hours with price, lead time and the COA for the lot you would receive.