Peptide manufacturer · private-label OEM · factory-direct
From peptide sequence to in-house production.
SeqLine Bio makes research peptides on its own line and sells them directly to B2B buyers. Every lot is on record: open the batch COA before you pay, start from one kit, then scale into bulk powder, lyophilized vials and private-label packaging with the team that made the lot.
In-house productionSynthesis, lyophilization, QC and packing under one roof
Start at 1 kitTen vials to test us before any bulk commitment
COA before paymentPublic batch records with HPLC purity and MS identity
Reply in 4 hoursPrice, lead time and documents, within business hours
One team, end to end
Specification to shipment, no hand-offs.
Raw powder · lyophilized vials · documents
Who you are dealing with
SeqLine Bio, in four sentences.
SeqLine Bio is a peptide manufacturer in China with its own production line, selling directly to qualified B2B buyers. We supply research-grade raw powder, lyophilized vials, neutral labels and private-label packaging. Every published lot has a public COA with HPLC purity and MS identity that you can open before ordering, alongside the Company Fact Sheet, the quality policy and the compliance boundary. We do not sell to consumers and we do not give dosing or medical advice.
| Entity | SeqLine Bio · seqline.bio · contact@seqline.bio · website WhatsApp RFQ button |
|---|---|
| Role | Manufacturer + private-label OEM, not a consumer storefront. |
| Verification path | Check Company Fact Sheet, current public COA records, quality policy and supplier verification pages before payment. |
Factory strength
Source-level manufacturing, built for the way B2B buyers actually order.
Buyers come to SeqLine Bio for stable raw material, lyophilized powder and packaging that ships without a trading house in the middle. The workflow follows real procurement: confirm compound and specification, prepare the batch documents, agree a sample or pilot quantity, then move into repeat supply once the lot is approved.
From raw material through lyophilization, labeling, document review and shipment tracking, one factory-side team stays on the order. Fewer hand-offs, no middleman markup, and a documented lot you can hold us to.
Supplier verification
Don’t take our word for it. Check the lot.
Most buyers find us while comparing peptide suppliers. Our answer to the trust question is procedural: verify first, then scale.
- Eligible sample orders start at 1 kit (10 vials), no bulk commitment attached
- Open the current batch COA before you pay
- Match the HPLC and MS records to the compound and lot you are buying
- Send a received vial to any lab you trust before a larger order
What buyers search for before they find us
legit direct peptide supplier · direct peptide supplier from China · factory-direct peptide supply · wholesale peptides · research peptide supplier with COA · current batch COA before payment · small trial peptide order · private-label peptide OEM supplier
Supplier verification checklist →
Wholesale peptides & bulk supply · Peptide supplier with COA / HPLC / MS · Manufacturer vs reseller · Independent testing
Products
Most-requested supply lines.
Open the catalog for specifications, quantities and document requests.
Production
Manufacturing and private-label packaging under one roof.
Raw material, lyophilized vials, neutral or branded labels and shipment follow-up run through one factory-direct workflow. No trading house, no re-labelled stock.
- Sample lots, low-MOQ pilots and bulk runs on the same line
- Neutral label by default, your label on request
- Specs, MOQ and lead time settled in one conversation
Quality
The COA is public. Read it before you order.
Every listed product and specification has a current batch COA in the /coa/ library. No WhatsApp, no RFQ, no login. Each PDF reports HPLC chromatographic purity and MS molecular-weight identity for that lot. Independent verification is welcome, and a confirmed quality issue is covered by replacement or refund under the quality policy.
Markets served
Research peptides and private-label OEM for B2B buyers worldwide.
SeqLine Bio ships research peptides, lyophilized powder and private-label orders to laboratories, distributors and brand owners in English-speaking markets, Brazil and other international markets. Documentation, destination and buyer track are confirmed before any invoice.
United States & Canada
Research-use supply and private-label OEM projects for US and Canadian labs, brands and distributors, with batch-document availability confirmed by product, specification and applicable lot.
United Kingdom & Ireland
Research peptides and neutral-label / private-label vials for UK and Irish B2B buyers and laboratories, with export documentation coordinated per order.
Australia & New Zealand
Factory-direct research-use peptides and OEM packaging for Australian and New Zealand research buyers and brand owners, quoted per compound and destination.
Brazil
Research peptides and private-label OEM supply for Brazilian laboratories, distributors and brand owners, with a Portuguese-language edition of this site, batch documents per lot and export paperwork coordinated per order.
Supplied as research peptides and B2B private-label services; buyers confirm local regulatory compliance in their destination market.
Next step
Pick products. Send one RFQ.
Tell us compound, quantity, format, destination and the documents you need. You get price, lead time and the batch records back within four business hours.