Quoted 4 days, arrived in 4. Tracking updated at every hop from dispatch to door.
Vendor documentation · maintained record
Nantong Guangyuan Chemical Co., Ltd.
Peptide supplier based in Nantong, Jiangsu, China, operating a multi-region warehouse network. Janoshik-tested and PeptideMeter verified. No storefront is recorded for this vendor.
9.3857 community reviews Verified, one record disputed
Dispatch and warehouses
Stock is held regionally, so an order ships from within the buyer’s own country rather than from the manufacturing site.
- Netherlands (Rotterdam) — European Union, 2-4 days
- Germany (Hamburg) — Germany, Austria, Switzerland, 2-4 days
- United Kingdom (London) — United Kingdom & Ireland, 2-3 days
- United States (California) — United States, 2-4 days
- Canada (Toronto) — Canada, 3-5 days
- Australia (Melbourne) — Australia & New Zealand, 3-5 days
Identity
- Legal name
- Nantong Guangyuan Chemical Co., Ltd.
- Short code
GGPeps- Also known as
- GGPeps, GYC, GYC Peptides, Guangyuan Chemical
- Storefront
- ggpeps.net →
- City
- Nantong
- Region
- Jiangsu
- Established
- not recorded
- First documented here
- 17 Jun 2024
- Specialty
- Regional warehousing — the shortest transit times in the directory for several destinations
- Record state
- Verified, one record disputed
The storefront is linked so a reader can verify a supplier directly. This page does not endorse suppliers, and no supplier has any influence over what appears on it — see the funding disclosure.
Verification record
Independent results submitted by members and recorded with the lot, the date, the method as reported, and the state. 3 verified, 1 disputed, 0 unverified.
| Date | Service | Compound | Lot | Method as reported | Result | State |
|---|---|---|---|---|---|---|
| 2026-05-09 | Janoshik | Semaglutide 5 mg | GY-26-4471 | RP-HPLC, 214 nm | 98.2% area | verified |
| 2026-02-15 | PeptideMeter | Tirzepatide 10 mg | GY-26-4102 | RP-HPLC, 220 nm | 97.9% area | verified |
| 2025-11-30 | Medutest | TB-500 5 mg | GY-25-3866 | RP-HPLC + LC-MS | 97.1% area; identity confirmed | verified |
| 2025-08-21 | VendorInvestigate | Lot traceability check | GY-25-3512 | Certificate-to-label reconciliation | Mismatch on regional warehouse stock | disputed |
- 2025-08-21, VendorInvestigate: Certificate referenced a different lot than the vial label. Corrected certificate issued; root cause described as warehouse picking. Recorded.
Documentation quality
3/5Assessment
4Records
4Services used
1Disputed
Certificates are adequate for purity and identity. The warehouse model complicates traceability: stock shipped from a regional warehouse has on two occasions carried a certificate referencing a different lot than the vial label, resolved both times but recorded.
Maintainers' assessment
Verified on results, with a documented traceability weakness specific to the warehouse model. If you order from regional stock, check that the certificate lot matches the vial before you rely on it. Transit performance is genuinely the best here for several destinations.
Community reviews
26 reviews from members with a record on this site. Aggregate rating 9.3 of 10 across 857 reviews.
Straightforward order, arrived as described, documentation adequate and complete. Nothing to add, which is the point.
Held locally in Australia, so the semaglutide 5 mg arrived on day 3 without an import step.
Solid on the NAD+ 500 mg. Purity where it should be, transit 3 days, paperwork in order.
No customs paperwork, no import wait — it came from their stock in the Netherlands and arrived day 3.
Fair pricing for the documentation standard, and delivery landed on day 3 as quoted.
Fourth order from them, all tesamorelin 2 mg. Sent one vial from each to PeptideMeter and the whole set landed inside half a point of each other. That flatness is exactly what I pay for.
Consistent rather than flashy. Everything lands in the high nineties, and it lands there every time.
Third order and it went the same way as the first two. Predictable in the way you want a supplier to be.
Documentation is complete and the numbers are steady. A dependable choice for routine work.
Steady supplier. Medutest results have agreed with their stated figures on every lot I have submitted.
Domestic dispatch from their stock in Canada. Straightforward, day 4, exactly as quoted.
Documentation is complete and the numbers are steady. A dependable choice for routine work.
VendorInvestigate has now seen 6 of their lots through me. Not one has come back outside spec.
The hexarelin 5 mg arrived on day 2 with the cold pack intact and the seal unbroken. Straightforward, exactly as described.
Good communication throughout, accurate lead time, and the parcel arrived on day 4.
Third order and it went the same way as the first two. Predictable in the way you want a supplier to be.
Shipped from their warehouse in the United Kingdom, arrived day 4, documentation complete.
Shipped from their warehouse in the United Kingdom, arrived day 3, documentation complete.
Sensible packing, sensible timelines, and a certificate that says what it should. No notes.
Everything about the order was routine in the best sense — quoted 5 days, arrived in 5.
Ordered MOTS-c 10 mg twice. Both vials reconstituted cleanly and both matched their certificates.
Reliable on the general catalogue lines. Purity figures cluster tightly and the certificates match the lots.
Peptide content reported at 99.0% alongside the purity figure, so I could convert straight to a working mass.
Pleased to find they hold stock in the United Kingdom. Domestic dispatch, day 3, no customs step at all.
Shipped with a stated storage recommendation and a shelf-life figure tied to it, without my asking.
Where GGPeps sells
Nantong Guangyuan Chemical Co., Ltd. sells from its own storefront. The link below is marked nofollow and sponsored; it is here so the identity facts and the verification records on this page can be checked against what the seller publishes, and for nothing else. This site is paid nothing for it.
Whatever a storefront claims, the lot on the vial has to match the lot on the certificate. That check is yours and nobody else can do it for you.
Discussed in
| Topic | Participants | Replies | Views | Activity |
|---|---|---|---|---|
|
Reporting a good result: why nobody bothers and why they should — one year on
Posting this under the heading it deserves: Reporting a good result: why nobody bothers and why they should — one year on Everything below is what sits behind that. Structured report rather than an opinion,…
|
+19 | 27 | 4.7k | 18mo |
|
Splitting a vial for two laboratories: how to do it without ruining both
Splitting a vial for two laboratories: how to do it without ruining both — setting out what I have, and where I think it stops being reliable. A logistics question, since the answers here are usually better…
|
+64 | 70 | 4.4k | 13mo |
|
Comparing documentation quality across the directory, tabulated
Comparing documentation quality across the directory, tabulated — setting out what I have, and where I think it stops being reliable. I would like to talk about documentation quality as a signal, separately…
|
+7 | 11 | 29k | 19h |
|
Why chargeback is not the safety net people assume
Asking directly, because I could not find a straight answer: Why chargeback is not the safety net people assume A logistics question, since the answers here are usually better than anywhere else I have…
|
+22 | 26 | 2.5k | 2d |
|
Why our vendor pages link the storefront and mark it sponsored
Why our vendor pages link the storefront and mark it sponsored — that is the question, and I have not found it answered plainly anywhere I have looked. A logistics question, since the answers here are usually…
|
+17 | 21 | 335 | 18mo |
|
One lot is one lot: when a report becomes a pattern
Posting this under the heading it deserves: One lot is one lot: when a report becomes a pattern Everything below is what sits behind that. Structured report rather than an opinion, following the format the…
|
2 | 19k | 14mo |
Maintenance
Maintainers: KLindqvist, customs_ledger, tracked_parcel. Next review due 28 October 2026.
To add a record, file a structured report in vendor reports with the compound, lot, service, method and result. Reports missing any of those are moved to the discussion rather than the record. Allegations without documentation are hidden under R6 and the hiding is logged.
On what each service's report establishes: Janoshik Analytical · PeptideMeter · Medutest · VendorInvestigate
Sponsored
Janoshik Analytical — independent third-party testingHPLC purity and mass-spectrometric identity on submitted samples, reported with the method stated. The laboratory most often cited in this community’s verification records.Independent testing →
Sponsored
GL Biochem (Shanghai) Ltd. — synthesis, directFounded 1998. ISO 9001 and cGMP certified, over 1,500 staff and 200-plus patents. Custom peptide synthesis and amino acid derivatives, with a batch certificate on every order.Custom synthesis →