# PeptiGLP1 (peptiglp1.com)

> GLP-1 research-peptide raw material site, manufactured by Pepti, Guangzhou. Semaglutide, tirzepatide, retatrutide, cagrilintide, mazdutide and survodutide as raw powder (from 5 g, shipped cold-chain) or lyophilized vials (1 kit = 10 vials). Sample MOQ 1 kit (10 vials); private-label OEM 50 kits (500 vials). Batch COA with HPLC purity and MS identity per lot; public records at https://peptioem.com/coa. For research use only. Not for human or veterinary use. Pepti does not present itself as a cGMP drug-substance (API) manufacturer or CDMO and does not publish a GMP certificate or DMF.

## Key facts
- Operator: Pepti, No. 18 Zhenliangyuan 2nd Road, Zhongluotan Town, Baiyun District, Guangzhou, China; email contact@peptioem.com; WhatsApp via https://peptiglp1.com/whatsapp (Pepti Supply, Mike)
- Lead-time ladder (typical): Sample kits 5–10 days; Production batch 14–21 days; OEM repeat order 21–28 days
- Independent data point: Janoshik Analytical report #210105, Retatrutide 20 mg sample, 19.52 mg content, 99.837% purity, analyzed 2026-10-07 (sample-specific) — https://verify.janoshik.com/tests/210105-Retatrutide_20mg_CZU2DSY2SYYQ
- Public COA library: 76 entries on peptioem.com as reviewed 2026-10-19

## Compounds
- [Semaglutide](https://peptiglp1.com/semaglutide): CAS 910463-68-2; C187H291N45O59; 4114 g/mol (PubChem CID 56843331); GLP-1 receptor agonist; 98.7–99.6% HPLC across 7 public records
- [Tirzepatide](https://peptiglp1.com/tirzepatide): CAS 2023788-19-2; C225H348N48O68; 4813 g/mol (PubChem CID 166567236); Dual GIP / GLP-1 receptor agonist; 98.4–99.7% HPLC across 9 public records
- [Retatrutide](https://peptiglp1.com/retatrutide): CAS 2381089-83-2; C221H342N46O68; 4731 g/mol (PubChem CID 171934787); Triple GIP / GLP-1 / glucagon receptor agonist; 98.72–99.55% HPLC across 9 public records
- [Cagrilintide](https://peptiglp1.com/cagrilintide): CAS 1415456-99-3; C194H312N54O59S2; 4409 g/mol (PubChem CID 171397054); Long-acting amylin analogue; 99.2% HPLC across 2 public records
- [Mazdutide](https://peptiglp1.com/mazdutide): CAS 2259884-03-0; C207H317N45O65; 4476 g/mol (PubChem CID 167312357); Dual GLP-1 / glucagon receptor agonist; 99.12–99.37% HPLC across 2 public records
- [Survodutide](https://peptiglp1.com/survodutide): CAS 2805997-46-8; C192H289N47O61; 4232 g/mol (PubChem CID 171378821); Dual glucagon / GLP-1 receptor agonist; no public batch record yet

## Pages
- [GLP-1 Raw Material Supplier: Semaglutide, Tirzepatide | PeptiGLP1](https://peptiglp1.com/): Factory-direct GLP-1 raw material from Pepti, Guangzhou: semaglutide, tirzepatide, retatrutide, cagrilintide, mazdutide and survodutide as raw powder or lyophilized vials with batch COA (HPLC, MS). Sample 1 kit; OEM 50 kits.
- [GLP-1 Peptide Manufacturing Capabilities, Guangzhou | PeptiGLP1](https://peptiglp1.com/capabilities): What Pepti does for GLP-1 raw material in Guangzhou: solid-phase synthesis of acylated peptides, preparative HPLC, lyophilization, vial filling (1 kit = 10 vials), neutral or private-label packaging, bulk powder from 5 g, custom sequences from 100 kits.
- [GLP-1 Peptide Quality: Batch COA, HPLC Ranges | PeptiGLP1](https://peptiglp1.com/quality): How Pepti documents GLP-1 raw material quality: a batch COA per lot with RP-HPLC purity and MS identity, published purity ranges per compound from 29 public records, and one independent Janoshik report, stated without exaggeration.
- [GLP-1 Raw Material FAQ: MOQ, Lead Time, COA, Boundary | PeptiGLP1](https://peptiglp1.com/faq): Answers for GLP-1 raw material buyers: 1-kit sample orders, 50-kit OEM minimum, typical lead-time windows, what the batch COA shows, CAS and molecular weight sources, independent testing, and the research-use boundary.
- [About PeptiGLP1: GLP-1 Raw Material by Pepti, Guangzhou](https://peptiglp1.com/about): PeptiGLP1 is the GLP-1 raw-material site of Pepti, a peptide manufacturer at No. 18 Zhenliangyuan 2nd Road, Zhongluotan Town, Baiyun District, Guangzhou. Who runs it, what it covers, how facts are reviewed, and what it does not do.
- [Contact Pepti: GLP-1 Raw Material RFQ by WhatsApp | PeptiGLP1](https://peptiglp1.com/contact): Send a GLP-1 raw material RFQ to Pepti, Guangzhou: WhatsApp (Pepti Supply, Mike) via the Pepti-RFQ button, or contact@peptioem.com. What to include, what you receive back, and how payment details are shared.
- [GLP-1 Raw Material Insights: COA, HPLC, MS, Storage | PeptiGLP1](https://peptiglp1.com/insights): Working guides for buyers of semaglutide, tirzepatide, retatrutide, cagrilintide, mazdutide and survodutide raw material: reading a COA, HPLC vs MS, storage, impurities, supplier qualification and regulatory status.
- [GLP-1 Order Photos: Shipment Batches from Pepti | PeptiGLP1](https://peptiglp1.com/order-photos): Real shipment photos of lyophilized vial kits leaving the Pepti packing bench in Guangzhou, grouped by shipment batch, recipient details blurred, peptiglp1 watermark; no invented dates or destinations.

## Insights
- [How to Verify a GLP-1 Raw Material Supplier Before You Pay](https://peptiglp1.com/insights/how-to-verify-glp1-raw-material-supplier): A repeatable routine for checking a GLP-1 raw material supplier before you pay: entity, batch records, lot-code chain, sample testing and red flags.
- [How to Read a GLP-1 Peptide COA, Field by Field](https://peptiglp1.com/insights/how-to-read-a-glp1-coa): Field-by-field guide to a research-use GLP-1 peptide certificate of analysis: header, dates, MS identity, HPLC purity, missing fields and a worked example.
- [HPLC Purity vs MS Identity: What Each Test Proves](https://peptiglp1.com/insights/hplc-purity-vs-ms-identity): RP-HPLC area-percent and ESI mass spectrometry answer two different questions on a GLP-1 peptide COA. What each proves, what each misses, and how to read both.
- [Raw Powder vs Lyophilized Vials for GLP-1 Research Peptides](https://peptiglp1.com/insights/raw-powder-vs-lyophilized-vials): How a released GLP-1 peptide lot is supplied as bulk raw powder or lyophilized vials, and what changes: traceability, weighing, labels, minimums and lead time.
- [GLP-1 Peptide Storage: Cold Chain, Retest and Handling](https://peptiglp1.com/insights/glp1-peptide-storage-cold-chain-retest): How to receive, store, log and re-examine lyophilized GLP-1 peptide raw material so the batch COA stays meaningful: cold chain, retest dates and aliquoting.
- [Impurities and Related Substances in GLP-1 Peptides on a COA](https://peptiglp1.com/insights/impurities-and-related-substances-glp1): How to read the impurity lines on a research-use GLP-1 peptide COA: which classes come from synthesis or storage, and how HPLC and MS show each.
- [GLP-1 Peptide Supplier Qualification Checklist for Buyers](https://peptiglp1.com/insights/glp1-supplier-qualification-checklist): A printable, section-by-section qualification checklist for any GLP-1 raw-material supplier, with the answer Pepti gives to each item and the three hard stops.
- [How to Check a GLP-1 Compound's Regulatory Status](https://peptiglp1.com/insights/how-to-check-glp1-regulatory-status): A buyer's method for checking the regulatory status of semaglutide, tirzepatide, retatrutide, cagrilintide, mazdutide and survodutide from primary sources: FDA pages and Federal Register notices, quoted verbatim with the date each was read.

## Terms
GLP-1 raw material supplier; semaglutide raw material; tirzepatide raw material; retatrutide raw material; cagrilintide raw material; mazdutide raw material; survodutide raw material; research peptide raw powder; lyophilized peptide vials; batch COA HPLC MS; peptide manufacturer Guangzhou; factory-direct peptide supply; research use only.