They report purity by RP-HPLC with the wavelength stated and peptide content separately. Two different numbers, correctly separated.
Vendor documentation · maintained record
Chinese Peptide Company Co., Ltd.
Research compound manufacturer trading as CPC (chinesepeptidecompany.net), based in Hangzhou, China, established 2001. Janoshik-tested and verified by Medutest, PeptideMeter and VendorInvestigate; supplies peptides, SARMs, injectable oils and raw materials with certificates of analysis.
9.71,164 community reviews Verified
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
- Chinese Peptide Company Co., Ltd.
- Short code
CPC- Also known as
- CPC, CPC Biotech, Chinese Peptide Company
- Storefront
- chinesepeptidecompany.net →
- City
- Hangzhou
- Region
- Hangzhou
- Established
- 2001
- First documented here
- 22 Jun 2024
- Specialty
- Long-established synthesis house; strong on catalogue peptides outside the incretin class
- Record state
- Verified
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. 4 verified, 0 disputed, 0 unverified.
| Date | Service | Compound | Lot | Method as reported | Result | State |
|---|---|---|---|---|---|---|
| 2026-04-25 | Janoshik | Semaglutide 5 mg | CPC-A6-2214 | RP-HPLC, 214 nm | 98.6% area | verified |
| 2026-01-13 | Medutest | Tirzepatide 10 mg | CPC-A6-1002 | RP-HPLC + LC-MS | 98.1% area; identity confirmed | verified |
| 2025-10-02 | PeptideMeter | CJC-1295 2 mg | CPC-A5-7781 | RP-HPLC, 220 nm | 97.4% area | verified |
| 2025-07-16 | VendorInvestigate | Documentation audit | n/a | Document review across 9 certificates | Adequate; two omissions noted | verified |
- 2026-01-13, Medutest: Largest related substance 0.6%, identified by mass as a des-Gly deletion sequence.
- 2025-07-16, VendorInvestigate: Injection volume absent on two certificates; supplied on request.
Documentation quality
4/5Assessment
4Records
4Services used
0Disputed
Certificates are complete for purity but frequently omit injection volume and rarely include a chromatogram unless requested. Requests are answered, usually within two working days.
Maintainers' assessment
Verified. Documentation is good rather than exemplary: the analytical content is there, the presentation requires you to ask. Impurity reporting is more detailed than most, listing individual related substances rather than a single total.
Community reviews
26 reviews from members with a record on this site. Aggregate rating 9.7 of 10 across 1,164 reviews.
5 lots logged now, purity 99.4 to 99.9%. A band that tight is worth more to me than one spectacular number.
Certificate claimed 98.7% on lot CPC-25-989. Medutest came back 99.0%. On an independent column that is as close to agreement as this gets.
Arrived on day 2 against a quoted 3. Customs paperwork was right first time, which is why it moved that fast.
Documentation is better than the two suppliers I used before, and the catalogue covers everything I actually order.
Domestic dispatch from their stock in the United States. Straightforward, day 5, exactly as quoted.
Support answered on a Sunday, correctly, with the batch record attached. That is well beyond what I expected.
Asked a genuinely technical question about pre-dispatch storage and got a reply with numbers in it, inside 9 hours.
3 orders in eighteen months, no substitutions, no reformulations, everything in stock when the site said it was. Boring is the highest compliment I have.
Good communication throughout, accurate lead time, and the parcel arrived on day 4.
Same lot documentation as the factory ships, but out of their warehouse in the United Kingdom, so it landed on day 4.
Vials wrapped individually, foam cut to fit, nothing loose in the box. Packing that has clearly been thought about.
Weighed 7 vials from the LL-37 5 mg order against label. Every one inside 2% of stated mass. Fill consistency is harder than purity and they have it.
Queried the related-substances total on lot CPC-25-932; they came back with method, column and detection limit. That depth is rare.
Reliable on the general catalogue lines. Purity figures cluster tightly and the certificates match the lots.
Janoshik has now seen 4 of their lots through me. Not one has come back outside spec.
Consistent rather than flashy. Everything lands in the high nineties, and it lands there every time.
Their warehouse in the United Kingdom had the epithalon 10 mg in stock and it shipped the same afternoon. Tracking never left the country.
Held locally in Germany, so the sermorelin 5 mg arrived on day 3 without an import step.
Fair pricing for the documentation standard, and delivery landed on day 4 as quoted.
Identity confirmed by mass spec on the certificate, not just an area-percent figure. Both questions answered on one page.
Solid on the GHRP-2 5 mg. Purity where it should be, transit 2 days, paperwork in order.
Stock said available, stock was available, and it shipped the same day. That sequence is not as common as it should be.
Steady supplier. Medutest results have agreed with their stated figures on every lot I have submitted.
Asked them to hold an order until I confirmed a lot number and they did, without fuss and without a restocking charge.
Pleased to find they hold stock in Australia. Domestic dispatch, day 4, no customs step at all.
Where CPC sells
Chinese Peptide Company 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.
Visit CPC at chinesepeptidecompany.net →
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.
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Maintenance
Maintainers: KLindqvist, impurity_table. Next review due 30 November 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 · Medutest · PeptideMeter · VendorInvestigate