Verification
How testing works
Every lot is HPLC–MS tested by an independent third-party laboratory before it is listed. Some lots carry a second, separate test from a real order placed against our own stock — that is a per-lot fact, not a blanket promise. The certificate for any lot is available on request.
The four steps
Vendor vetted
We only buy from vendors with a documented record across many independently assayed batches - before a single vial is ordered.
Independent assay
Identity, purity and mass, measured by HPLC-MS at a third-party laboratory.
Second opinion
Some lots are re-tested by a separate laboratory from a real order. This is per lot, not every lot.
Certificate
The certificate names the lot printed on the box, and is available on request.
Vetting the vendor, not just the vial
Most suppliers test what they already bought. That catches a bad batch after the money has moved, and it tells you nothing about whether the next one will be clean.
We start a step earlier. A vendor has to have a documented record across many independently assayed batches before we place a first order — not one clean certificate, but a history: consistent purity, accurate fill against label, no endotoxin failures, and standing that has held up over time. Vendors with a thin record, a single good run, or a history of being delisted do not make the list, however good the price is.
Then we test anyway.
When a lot is tested twice
A single test proves what was in one vial on one day, and that is what every lot gets: an independent HPLC–MS assay for identity, purity and mass before the material is listed.
Some lots get a second, separate test — material pulled from our own shelf the same way a customer's order would be, sent to a different laboratory. That answers a different question: whether what we ship still matches what we received.
We do not claim it for every lot, because it is not true of every lot. Ask about a specific lot and we will tell you which tests it has behind it.
What the certificate covers
Each Certificate of Analysis records three things measured by HPLC-MS:
- Identity — that the material is the compound named.
- Purity — the proportion of the sample that is that compound.
- Mass — how much is actually in the vial, against what the label says.
Testing is done by independent third-party laboratories — not an in-house bench. The laboratories we use are Sterigenix, ACS Peptide Testing, ILS Laboratories, Testides, Chromate, Freedom Diagnostics, Janoshik and Accumark Labs. Which one ran a given lot is recorded on that lot's certificate, along with the laboratory's own reference number.
Our threshold is 99%. A certificate names the lot printed on the box, so the document and the material refer to the same batch — nothing is anonymised or averaged across batches. Certificates are available on request for any lot: quote the lot number from the box, or the invoice number, and we will send it.
Finding your certificate
Match the lot number printed on the box against the published lots. Every lot is also listed on the published lots page, and linked from each material's page in the catalog.
Stock rotation
First in, first out. Orders are fulfilled from the oldest qualifying lot, so material does not sit, and the lot you receive is traceable to the batch it came from and to that batch's published results.
Every lot we sell has two certificates behind it. Ask anyone else for theirs.
What it costs
Why we are not the cheapest
Independent testing is not a rounding error. A single assay runs about $500 per compound, per batch — and we run two, at two different laboratories. That is roughly $1,000 spent before a single vial is listed, on every batch of every material.
Spread across a batch, that lands on every vial. At fifty vials it is twenty dollars each; at a hundred, ten. It is the single largest reason our prices sit above sellers who publish no certificates at all — the gap is substantially the testing.
Figures are our own testing spend, not an industry average. Assay pricing varies by compound and by panel.