How to get a peptide tested in Europe, and how to read the certificate you get back

Most guides skip the boring parts, which are the parts that go wrong. This one is mostly boring parts.

The process, start to finish

1. Pick the compound and the panel.

You have to say what the compound is. Analysis is comparative: the laboratory measures your sample against a reference standard, a known-pure sample of the compound it is supposed to be. Without knowing which standard to load, there is nothing to compare against.

Then pick a panel. Identity, content and purity answers "is this the right molecule, and is the vial full". Adding endotoxin and microbiology answers "and is it clean".

2. Pay, and read the email.

Your reference number and the posting address arrive within a minute. No account, no registration, no identity check.

3. Pack the vial properly.

Write the reference number three times: on the vial, on a slip inside the packet, and on the outside.

Labels come off in transit and outer packaging gets thrown away before the contents reach the bench. A vial with no reference cannot be matched to an order. Three copies means two can fail.

Post it tracked. It goes straight to the laboratory rather than to us and then onward, because handling a sample twice is how samples get lost.

Will posting ruin it? Freeze-dried powder is the stable form, which is the point of freeze-drying it, and it tolerates ordinary post at ordinary temperatures for the days a European delivery takes. Peptide already mixed into liquid is a different matter and is not what you should send. If something did go wrong in transit, it shows up as extra peaks on the chromatogram.

4. Wait the actual amount of time.

Seven working days for identity, content and purity, counted from when the laboratory has the vial rather than from when you ordered.

The full panel adds roughly two weeks, because microbiological testing works by giving anything present enough time to grow. The incubation is the test. No laboratory can shorten it.

5. Read the report.

Which brings us to the part most people get wrong.

What a certificate has to contain

Five fields. If any are missing, treat the document as decoration.

The batch or lot number of the vial tested. Without it, the report is about some vial, not the one in your hand. A vendor tests one batch, the certificate is genuine, and then it gets shown for the next fourteen months while other batches ship behind it.

The date the sample was received, not only the date the report was issued.

Content in milligrams, not just purity as a percentage. Purity is a ratio: your compound's peak area divided by the total area of everything the detector saw. A perfectly pure 10 mg vial holding 6.5 mg of material passes a purity test and fails the customer.

The method beside each result. HPLC for purity. Endotoxin as a number in EU per vial rather than the word "negative", because a word is somebody else's decision using a threshold they did not print.

A way for somebody who is not you to check it. This is the one that matters most, and the one most certificates fail.

Why the last one matters

A PDF proves nothing about who made it. Anyone with a text editor can change a number in a PDF, and the result looks exactly like the original.

A certificate sitting on a vendor's own server is the weakest form of evidence, because the vendor controls the server.

So the useful question about any report is not "does this look official" but "can I check this somewhere the seller does not control". With Janoshik that is their unique key lookup. With Veritalys it is a permanent report number that anyone holding it can check on our verify page, with no login and nothing to download.

If a vendor's certificate cannot be checked anywhere except their own website, you have a claim, not evidence.

Four questions to ask a vendor

Ask these before you buy, from anyone.

Does the certificate carry the batch number that is on the vial I will receive?

Does it report content in milligrams, or only purity?

Can I check the report somewhere you do not control?

When was it tested?

A good vendor answers all four without getting defensive. That reaction is most of the information.

What a test can and cannot tell you

One test on one vial is evidence about one vial. It does not certify the batch, because filling varies. It says nothing about the next production run, or about how the vial was handled afterwards.

Confidence in a batch comes from testing each batch.