01
The seven parts of a certificate
Every certificate we publish has the same seven parts, in the same order. The numbers match the specimen on the right.
| Part | What it tells you | What to check |
|---|---|---|
| 1Lab and report number | Who ran the tests | The lab exists, is independent of the seller, and can confirm the report number |
| 2Product and lot | Which material was tested | The lot number matches the one printed on your vial |
| 3Purity, RP-HPLC | The main peak's share of everything detected | A number with the method and wavelength stated, and the trace shown |
| 4Identity, ESI-MS | Whether the molecule has the expected mass | Both the expected and the found mass are printed, close together |
| 5Appearance | What the lab saw when it opened the vial | Matches what you see: colour and an intact cake |
| 6Net peptide content | How much of the powder is peptide, where measured | Present if you need exact amounts; absent is common and not a fault |
| 7Date of analysis | When the tests were run | Before the lot went on sale, and not years old |
02
Five checks before you trust one
- The lot number on the vial is on the certificate.A certificate without a lot number could describe anything. Ours open from the number on the label.
- The lab is named and you could contact it.An unnamed "third-party lab" cannot be checked. A named lab can confirm its own report number.
- There is an identity result, not only purity.Purity says how clean the sample is. Only mass spectrometry says whether it is the right molecule.
- The trace is shown.A chromatogram lets you see the peaks for yourself. A bare percentage asks you to take it on trust.
- Different lots have different results.Real lots vary a little. The same 99.9% on every product and every lot is a reason to ask questions.
03
Red flags
One certificate for many lotsThe same document attached to every batch of a product.
No mass resultPurity alone cannot tell you which peptide is in the vial.
Edited or cropped reportsMissing lab headers, blurred dates or mismatched fonts.
Purity above 99.9%, every timePossible, but rare across many products and lots.
A lab that cannot be foundNo website, no address, or no reply when you ask about the report.
A date after the sale dateThe material was sold before anyone tested it.
04
Common questions
Why is purity not 100%?
Synthesis leaves small amounts of shorter or altered chains. HPLC separates them, and they show as small peaks next to the main one.
Is higher purity always better?
For identity and consistency, yes. But a 99.5% result with no mass check tells you less than a 98.5% result with one.
Why does net peptide content matter?
Because a vial labelled 10 mg holds 10 mg of powder, not 10 mg of peptide. Salts and water make up the rest.
Can I check one of your certificates myself?
Yes. Enter the lot number in the lot register, then contact the lab named on the report with its report number.