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.
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.