What we measure, how we measure it, who checks the result, and what happens when a lot doesn't pass.
A lot is not listed for sale until all seven results are recorded and within specification. There is no partial release and no conditional release.
| Test | Method | Specification | What it catches |
|---|---|---|---|
| Purity | RP-HPLC, UV 214 nm | ≥99% area | Truncated sequences, deletion peptides, synthesis by-products |
| Identity | ESI-MS / MALDI-TOF | ±1 Da of theoretical | Wrong compound, wrong salt form, oxidation |
| Net peptide content | Nitrogen analysis | Reported, salt-corrected | Overstated milligrams — counter-ion and water counted as product |
| Water content | Karl Fischer | ≤8% | Incomplete lyophilization, moisture ingress, stability risk |
| Endotoxin | LAL, kinetic chromogenic | ≤0.05 EU/mL | Bacterial pyrogens that confound inflammatory readouts |
| Residual solvent | Headspace GC | TFA <0.5% | Cytotoxic purification residue invisible to purity assays |
| Heavy metals | ICP-MS | <10 ppm total | Catalyst and reagent carryover from synthesis |
A supplier testing its own product and publishing its own result has an obvious incentive problem. The fix is not a better promise — it's a second lab with nothing to gain.
Every incoming lot is split into two samples before any in-house work begins. One stays with us, one is sent out under a blinded identifier.
Both laboratories run purity and identity independently. Neither sees the other's numbers until both are filed.
If the two purity figures differ by more than 0.5% absolute, the lot is held and investigated. It does not ship while the discrepancy is open.
A failed lot is quarantined, logged against its supplier, and destroyed. It is not sold at a discount, not relabelled as a lower grade, not blended into a passing lot, and not diverted to a secondary channel. Suppliers with two failures in a rolling twelve months are removed from our approved list.
Each vial carries a lot number that resolves to a complete record: which synthesis run produced it, when it was received, who assayed it, which third-party laboratory confirmed it, and who signed the release.
That record is what makes the certificate meaningful. A purity figure with no traceable lot behind it is a marketing claim, not an analytical result — it can be reused indefinitely across production runs of wildly varying quality, and frequently is.
Search the certificate library| Lyophilized, long term | −20 °C, desiccated, dark |
| Lyophilized, in transit | Ambient tolerated, 5–7 days |
| Light sensitivity | Amber vial or foil overwrap |
These analyses establish chemical identity and purity for laboratory use. They are not, and are not intended to be, evidence of safety or suitability for administration to humans or animals. No amount of analytical documentation makes a research reagent a drug.
The whole library is public. No account, no email gate, no purchase required.