Lab standards
Every compound supplied by Vexar Lab is verified against a consistent analytical standard before dispatch. This page sets out our purity process, testing methodology, and batch numbering system.
Peptide purity standard
All compounds are specified to a minimum purity of ≥99%, determined by high-performance liquid chromatography. Purity figures are stated per compound on each product page alongside the analysis method used.
Testing methodology
HPLC-UV — purity determination
High-performance liquid chromatography with UV detection (HPLC-UV) is used to quantify peptide purity and resolve related impurities. The chromatographic profile establishes the ≥99% purity specification for each batch.
ESI-MS — mass confirmation
Electrospray ionisation mass spectrometry (ESI-MS) confirms the molecular weight of each compound, verifying compound identity against the expected theoretical mass.
Together, HPLC-UV and ESI-MS provide a two-part analytical check: HPLC confirms how pure the material is, and mass spectrometry confirms that it is the correct compound.
Batch numbering system
Each production batch is assigned a unique identifier in the following format:
| Format | Meaning |
|---|---|
| VX- | Vexar Lab prefix |
| [COMPOUND] | Compound code (e.g. BPC157) |
| [YYMM] | Year and month of batch |
| [X] | Batch letter within that month |
Example: VX-BPC157-2506A — Vexar Lab BPC-157, batched June 2025, batch A. The batch identifier appears on every product page and on the vial where labelling is applied.
Storage & handling
Sealed lyophilised vials are stored at −20°C, away from light and moisture. Lyophilised stability and reconstituted storage windows are stated per compound on each product page.
How we verify peptide purity
Every compound Vexar Lab supplies is checked for peptide purity before it ships. We verify each batch to ≥99% by HPLC, confirm identity by mass spectrometry, and assign a batch number so results are traceable. Certificates of Analysis are available on request. Browse our research peptides.
Consistent peptide purity is what separates a reliable research supplier from the rest. Our methodology mirrors the analytical rigour expected in peer-reviewed research. All compounds are supplied strictly for in-vitro laboratory research, in packs of 10 vials, with a £300 minimum order and £45 flat worldwide shipping.
