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.
Frequently asked questions
- 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.