Quality: what we test on every lot

Each lot is tested before release, and the certificate shows the measured results for that lot. The lot certificate is on request: ask on WhatsApp for the certificate of the current lot and read the numbers before you pay.

Release tests per lotA lot ships only when every test conforms

Mass spectrometer and HPLC system on a laboratory bench, with a spectrum on the monitor — Mass spectrometry confirms the identity of every lot, and RP-HPLC measures its purity.

Test	Method	Specification
Purity	RP-HPLC	≥ 99.0%, with the measured value printed on the certificate
Identity	Mass spectrometry (MS)	Measured mass matches the expected molecular mass
Net peptide content	Calculated from purity, water and counter-ion	Reported per lot
Water content	Karl Fischer titration	Reported per lot
Appearance and reconstitution	Visual check	White to off-white lyophilized powder; copper peptides (GHK-Cu and blends with it) are blue. Dissolves to a clear solution.

How a certificate reads

The certificate names the product, its catalogue code and the lot number, which is the code without the CPS prefix followed by a six-digit date. Below that it lists each test, the method, the specification and the result.

The block on this page is a layout sample. The lot and date fields are placeholders, and the certificate you receive carries the real values for your lot.

A vial with a sample CPS Biotech label standing on a signed certificate — Shown with a sample label for the photograph; every vial ships unlabeled, with a plain cap.

Sample certificate layoutFor illustration only. This is not a certificate for a real lot.

Product: Tirzepatide 10 mg
Code: CPS-TZ10
Lot: TZ10-YYMMDD (placeholder)
Form: Lyophilized powder, 3 mL vial
Issued: YYYY-MM-DD (placeholder)

Test	Method	Specification	Result
Purity	RP-HPLC	≥ 99.0%	99.4%
Identity	MS	Matches the expected mass	Conforms
Water content	Karl Fischer	Reported	3.1%
Appearance	Visual	White lyophilized powder	Conforms
Reconstitution	Visual	Clear solution	Conforms

Conclusion: the lot meets the release specification. For research use only.

Re-test policy

Buyers may re-test any lot at a laboratory of their choice. When a result falls under specification, we reimburse the test and replace the lot. Send us the report with the lot number to start.

What a certificate does not prove

A certificate describes the tested lot on the day it was tested. It does not cover vials from another lot, and it cannot speak for how the vials were stored after dispatch. Storage from delivery onwards is the buyer's responsibility, so keep sealed vials frozen as the certificate says.

Where the peptides are made

Synthesis, purification and lyophilization take place at our partner facility in Guangdong, under GMP-aligned practices. HPLC and MS testing are done at the partner plant for every lot. Our office in Hong Kong handles quotes, invoices and dispatch documents.

Ask on WhatsApp for the certificate of the current lot of any reference.

Ask for a certificate