How to tell if a peptide is genuine

You cannot tell by looking at the vial. Lyophilised white powder looks identical whether it holds the sequence it claims or not, whether it is 99% or 60%, whether it is the right compound or a cheaper one with a similar name. That is why this market works the way it does: the product is indistinguishable by eye, so the only check available is a documentary one.

The good news is that the documentary check exists, costs almost nothing, and is used badly by nearly everybody. What follows are the four things a certificate of analysis settles, in the order worth reading them.

First: who signed the report

A certificate of analysis is issued by an analytical laboratory about a specific sample. The first question is not what it says but who is saying it.

If the document carries the letterhead of the supplier selling it to you, it is not a certificate of analysis — it is a sworn statement formatted as a PDF. A report's value comes from being issued by somebody who gains nothing from the result. An independent laboratory paid to measure gets paid the same whether the figure comes back good or bad.

In practice a handful of laboratories recur across this market. Janoshik Analytical is the one that analyses the lots published here. The name itself matters less than that it is a verifiable third party and that the report arrives on their letterhead rather than transcribed.

Second: which method was used, and what each one measures

This is where most conversations about purity fall apart, because "purity" gets discussed as though it were one thing.

• HPLC (high-performance liquid chromatography) separates the sample's components and measures what proportion belongs to the main peak. It answers *how much of this is a single substance*. 99.7% by HPLC means 99.7% of the detected material corresponds to one peak.
• Mass spectrometry measures molecular mass and answers a different question: *that majority substance — is it the one it claims to be?* A compound can return 99% purity by HPLC and be the wrong peptide. HPLC tells you there is one thing; mass tells you what that thing is.

A report carrying only HPLC is answering half the question. Both together are the standard, and both should travel with every lot.

There is a third measurement almost nobody reads and it matters: content. A vial labelled 10 mg may hold 10 mg, 8 mg or 12 mg of material. The Retatrutide report published here states 11.96 mg of content against a 10 mg label. Purity and content are different things, and a vial can be immaculate on one and wrong on the other.

Third: the task number, and whether it verifies

Every serious laboratory numbers its reports. That number is what turns a PDF into a citable document, because it lets you go to the laboratory and ask whether the report exists and says what the seller claims it says.

A certificate with no verifiable task number is a picture. And pictures get edited.

It is worth being specific about the limits here, because this is another place the trick lives. Of the four reports published on this site, two carry a verification link that works against the laboratory's own site and two carry a printed key with no address, because the URL printed on the certificate itself errors when opened. Those two print the key and say where it is redeemed, without a link, rather than sending you to a broken button. A link that does not open is worse than none: it looks like verification and is not.

Fourth: whether the report belongs to *your* lot

This is the one most often skipped. A supplier can publish a real certificate, from a real laboratory, with a real number — for a lot analysed two years ago that has nothing to do with the vial about to be shipped.

A certificate is valid for the lot it analysed. The right question is not "do you have a certificate?" but "will you send me the certificate for the lot I am receiving?". If the answer is a generic PDF already on the website, the real answer is no.

The signals that something does not add up

After enough reports, the patterns repeat:

• Purity always lands on the same round number. Real lots return 99.669% and 99.893%, not 99.5% eleven times running. A tidy repeated figure is a written figure, not a measured one.
• The certificate is a screenshot cropped to the results table. The letterhead, the date and the signature are the argument; a crop to the results is the seller's summary wearing a document's clothes.
• The supplier publishes its best historical result as the standard. The floor is published here instead: the lowest figure in any of our reports is 99.669%, on MOTS-c. A headline built on the best lot breaks with the next one.
• There is a wall of green seals. GMP, ISO, FDA, "physician approved". All drawable in any graphics editor and linked to nothing. A seal anyone can draw is evidence that anyone drew one.
• Prices are published and suspiciously flat. Not proof of anything alone, but a complex compound costing the same as a trivial one suggests the synthesis is not being costed.

What a supplier's website cannot prove

No claim on a web page is evidence of what is in the vial. Not "99% purity guaranteed", not "third-party tested", not "pharmaceutical grade". Every one of those phrases costs the same to write true as false, which is exactly what makes them useless as a signal.

The one claim a supplier cannot cheaply fake is a document on somebody else's letterhead, with a number that can be looked up and a date. That is why the full reports are published, uncropped, exactly as the laboratory printed them, and why every lot dispatched travels with its own.

A note on what this material is

All of the above concerns verifying the identity and purity of laboratory reference material. The peptides PeptoClinic supplies are for in vitro and laboratory research use only. They are not medicines, not supplements, and not approved or intended for human or veterinary consumption. No doses, administration routes or use protocols are published.

A certificate of analysis states what a vial contains. It does not, and cannot, state that it is safe for a person.