Searches for "semaglutide API sourcing" and "semaglutide API documentation" have grown steadily as GLP-1 peptides moved from a handful of originators to a broad research and manufacturing ecosystem. This guide explains what a B2B buyer should expect from a supplier of Semaglutide (CAS 910463-68-2), Tirzepatide (CAS 2023788-19-2) and related peptides, and where the compliance lines sit. It is written for research organisations, contract manufacturers and licensed distributors, not for individuals.
Who can buy, and who cannot
Pharmaceutical-grade and research-grade GLP-1 peptides are supplied by WYOO only to qualified business buyers: research laboratories, CDMOs, peptide manufacturers and licensed distributors, after a short qualification. All material is research use only unless a buyer holds the licences required in its jurisdiction. We do not ship to residential addresses, do not sell to individuals, and do not give medical, dosing or reconstitution advice. A supplier that skips these checks is exposing you to regulatory and reputational risk.
The documentation set to request
| Document | Purpose | What a credible version contains |
|---|---|---|
| COA | Batch release | HPLC purity (typically ≥ 99%), LC-MS or MALDI identity, peptide content, water content, acetate/TFA content, lot number, test date, signature |
| Third-party test report | Independent confirmation | Report from a recognised lab (for example Janoshik) tied to the same lot number |
| MSDS / SDS | Safety and shipping | Correct CAS and hazard classification |
| Method summary | Method transfer | HPLC gradient, column and reference standard used |
| Stability statement | Storage planning | Recommended storage (typically 2 to 8 °C, protected from light) and retest period |
| Origin and export documents | Customs | Commercial invoice, packing list, HS code, certificate of origin on request |
Documents such as DMF access, GMP certificates or regulatory starting-material dossiers are available only from the originating manufacturer for pharmaceutical use; a sourcing partner can broker that conversation but should never fabricate them.
How to qualify a supplier in two weeks
- Week 1: send a written spec (purity, form, counter-ion, quantity, packaging) and request a recent COA plus a third-party report on the same lot. Ask for the manufacturing site. Order a small sample, typically 1 to 5 g, under research-use terms.
- Week 2: test the sample by HPLC and mass spectrometry in your own lab or a third party. Compare peptide content, not just purity. Confirm how the supplier handles an out-of-specification result before you place a volume order.
Commercial norms for GLP-1 APIs
MOQ is usually lower than for cosmetic peptides because unit value is high: from 10 g for evaluation, with tiered pricing at 50 g, 100 g and above. Lead time is 5 to 10 working days for in-stock lots. Payment is T/T with a deposit for new accounts. Shipping is by express courier at 2 to 8 °C with cold packs; a credible supplier will describe the packaging before you ask.
Red flags specific to GLP-1 peptides
- Vials or kits marketed with dosing language, or offers to ship to individuals.
- COAs without a lot number, or a third-party report for a different lot.
- Purity stated without peptide content or counter-ion information.
- No qualification questions asked of you as the buyer.
How WYOO handles GLP-1 enquiries
WYOO is a sourcing partner with audited partner factories. GLP-1 peptides are quoted only after a brief qualification (company, use case, jurisdiction). We supply a COA with every batch, arrange third-party testing on request, ship under research-use terms to business addresses only, and put price, MOQ, lead time and documents in one written quote. Qualified buyers can start through the contact page or WhatsApp.
Questions fréquentes
- Can individuals buy Semaglutide API from WYOO?
- No. GLP-1 peptides are supplied only to qualified business buyers such as research laboratories, CDMOs and licensed distributors, for research use only, to business addresses.
- What should a credible Semaglutide COA include?
- HPLC purity (typically ≥ 99%), LC-MS or MALDI identity, peptide content, water and acetate or TFA content, lot number, test date and a signature. A third-party report should reference the same lot.
- What is the MOQ and lead time for GLP-1 peptide APIs?
- Evaluation quantities start from 10 g with tiered pricing at 50 g and 100 g. In-stock lots ship in 5 to 10 working days after payment, by express courier at 2 to 8 °C.