Quality control

Tested by a named lab. Published in full.

Anyone can write a purity figure on a page. The only thing that means anything is a report from a named third-party laboratory, tied to the specific lot in your hand, that you can read before you spend money. That is what this page is about, and every claim on it can be checked — including the ones that come with a caveat.

Who does the testing

Independent laboratories

Testing is done by third-party laboratories, not in-house and not by a supplier vouching for its own material. We use more than one, chosen for the test being run, and every certificate names the laboratory that issued it along with its report number — so you are never asked to trust a laboratory name on a marketing page instead of the one on the report you are reading.

Testing is by independent third-party laboratories; Vanguard Laboratory is A2LA-accredited (certificate 6377.01.01). We claim no accreditation for any other laboratory. Read that for what it is: an accreditation tells you a laboratory runs an audited quality system and submits to outside assessment. It does not by itself tell you that the specific purity assay on your certificate was performed under that accreditation, and we are not going to imply that it does. Each report carries the laboratory, the method and the measured result; that is the record worth checking.

Method: HPLC-UV/VIS
Laboratory: Named on each certificate
Accreditation: Vanguard Laboratory: A2LA certificate 6377.01.01. None claimed for any other lab
What an accreditation covers: The laboratory’s quality system, not necessarily this assay

The laboratories

Who issued our published certificates

Kovera LabsLocation not printed on its report
Vanguard LaboratoryOlympia, WAUS lab

A laboratory is marked as a US lab only when the address printed on its own report is in the United States.

What gets checked

What the laboratory checks

Identity checked against a reference standard

Where the report carries an identity test, the lot is run by HPLC-UV/VIS and compared to a reference standard for the compound it claims to be, and the certificate records it as a pass rather than as an unsupported assertion. Not every report carries that row — the Tesamorelin certificate reports purity and quantity only — so read the certificate rather than assuming it.

Purity measured, per lot, and published

Chromatographic purity is measured for each production lot individually and published with its margin of error. It is never averaged across a product line, and a weaker lot is not hidden behind a stronger one. If a lot came back lower than we would like, the certificate says so.

Quantity verified against the label

The assay also reports how much peptide is actually in the vial, so a 20 mg label can be checked against a measured figure rather than taken on trust. That number is on the certificate alongside the purity.

Sealed on despatch

Vials are sealed against light, moisture and tampering, and stay sealed until they reach the bench. A verified lot is only worth anything if it arrives in the state it was tested in.

Shipped dry, shipped fast

Material is lyophilized under controlled conditions and sealed against light and moisture. Lyophilized material is stable at room temperature in transit, so nothing ships cold, and orders are despatched quickly to keep the time in transit short.

Published results

Published per lot

Each certificate carries its own measured result

That is the real spread, low end included. A single rounded-up number would be easier to market and would tell you nothing about the vial you are actually buying. Each product page shows its lab report status, and the certificate library lists every published report.

Read the certificates

How to read one

What is on a certificate of analysis

A certificate is only useful if you know what you are looking at. Here is every field on ours and what it is telling you.

Compound: What the lot was tested as. This has to match the product you are buying.
Laboratory ID: The laboratory's unique identifier for the tested sample, printed on its report (Kovera prints it as a Report ID). This is what the certificate database is searchable by.
Chromatographic purity: The measured purity, with its margin of error. The single most useful number on the report.
Quantity: How much peptide the assay found, so the labelled mass can be checked.
Method: The instrument and detector used. Ours is HPLC-UV/VIS.
Date reported: When the lab issued the result. An old date on a recently shipped vial is worth asking about.

Look up a certificate

Every published certificate is searchable by compound name or by its Report ID or Laboratory ID. You do not need an account, and you do not need to have bought anything.

Certificate database →

For research use only. Certificates describe the material as tested by the laboratory named on the report. Nothing sold by PepXtide is for human or veterinary consumption, and none of it has been evaluated by the FDA.