The report looks perfect the whole way down. There is a second number on it, one row up, and most sellers never put it on a product page at all.
Two lines in the results box
Purity
99.744%
the figure every seller
puts on the page
Amount
22.43mg
the figure that says what
is actually in the vial
Crystal Peptides, batch RT6423CP, analysed 25 May 2026
The report is one page. A logo at the top. A batch number. A small box of results in the middle.
You know where you are going before the page finishes loading. The thumb moves. The eye drops into the box and lands on the bold percentage.
99.744%.
That is the number. The one we print on the product page. The one people screenshot. The one that ends the argument in a group chat.
Now go back up one row.
Directly above the purity line, in the same box, on the same page, sits a second result. It is one short line, and it is easy to read straight past on the way down.
On the Crystal Peptides report for Retatrutide 20mg, batch RT6423CP, that
line reads:
Retatrutide 22.43 mg.
The vial is labelled 20 mg. The laboratory measured 22.43 mg. About twelve percent over what the label promises.
On the American Peptides certificate for the same compound at the same size, lot
RETA20-0803, the same row reads 20.22 mg against a 20 mg label.
One percent over.
Both clear the bar. They are nowhere near each other, and that spread is the whole reason to read the row.
Here is why that row is the one you wanted.
Purity is a percent, and a percent is a ratio. Take powder that is 99.6% pure and pour half of it away. What is left is still 99.6% pure. Pour half of that away too. Still 99.6%.
The number does not move. It cannot move. It has nothing to measure itself against except the powder already in the glass.
So the same clean figure survives all the way down. That is not an accusation about anyone. It is arithmetic.
And you cannot settle it by looking. Inside the vial is a small amount of freeze dried white powder. You cannot weigh it by eye. Nobody can.
There are two things you might want to know about a vial, and people tend to collapse them into one.
Retatrutide 22.43 mg
How much is in the glass. An amount, in milligrams, that can be compared against the number printed on the label.
Purity 99.744%
What the material is, as a proportion of itself. A quality score for the powder that is present. It says nothing about how much is present.
Both are on the same certificate. Both came from the same sample. They answer different questions, and only one of them is ever quoted in marketing.
A seller can be entirely honest and still only ever show you the second one, because the second one is the number the whole market learned to ask for. That is why the row above it goes unread even when it is printed right there.
The amount is never missing from the laboratory. It is missing from the page. It sits on the certificate one row above the figure everybody quotes, and almost nobody puts it in the copy.
Janoshik price list / 73 peptide tests
Almost every other claim a seller makes can be tested by a careful reader for free.
Is a laboratory named on the certificate? Look. Does the batch code on the report match the one on the product page? Compare them. Is there a verification code you can type on the lab's own website? Type it.
The amount is different. To check it you need an instrument, and the instrument is not something anyone has at home.
“So aside from paying a fortune to test them, how do i know if its good?”
r/Peptides
He has a point, and the numbers are worth knowing. Janoshik publishes its price list: 73 peptide tests, and the cheapest of them is 215 dollars.
Retatrutide starts at 105 dollars at one of the sellers on this site. So the cheapest test on the list costs about twice the product, a full panel costs several times it, and you would be paying either one after your money has already gone.
Which means the amount gets settled on somebody else's paperwork or it does not get settled at all.
Peptide forum / group buy thread
The informed end of this market did not wait for sellers to sort this out.
On group buys, where a set of buyers order a batch together and pay for testing between them, the terms get written down before anyone sends money. One poster set out what theirs required:
“The guidelines I'm referring to on this GB was purity of at least 99% and it was. The quantity was to be at least 90% of 10 mg, and it was (I think 9.4 but not positive).”
Peptide forum, group buy thread
Read what that person asked for. Not one pass mark. Two.
A purity floor, at 99 percent. And an amount floor, at 90 percent of the labelled 10 mg. Their batch came in around 9.4 mg, so it cleared the second bar with a little room.
That is the whole idea, written by somebody spending their own money. Two questions, two numbers, and a pass mark for each.
Set both reports against the same two bars. Crystal Peptides: purity 99.744%, so it clears the first, and 22.43 mg against a 20 mg label, so it clears the second one going the other way. American Peptides: purity 99.79%, and 20.22 mg against a 20 mg label. Two passes, eleven percentage points apart on the row nobody reads.
Janoshik 163572 / 25 May 2026
These are two published certificates for two real batches, from two sellers and two laboratories. Not examples and not templates.
The results box holds two lines, and the amount sits directly above the percentage.
Crystal Peptides. Retatrutide 22.43 mg above Purity
99.744%. Batch RT6423CP, task #163572, analysed 25 May 2026
by Janoshik. The tests-requested field reads “Common GLP-1 peptide blind test”,
so the laboratory was not told what it had.
American Peptides. Content 20.22 mg and Overall purity
99.79% on adjacent rows, each with its method named. Lot RETA20-0803,
issued 17 August 2026 by Bioviridian Inc., signed by a named principal chemist.
Both reports carry a photograph or a verification code that the seller cannot edit after the fact.
Look at the label in that photograph. It reads Retatrutide, 10 mg, 99% Purity.
Both of those numbers were printed before anything went into the glass. A label is a statement of intent. The report is the measurement.
You can run this on us, and on whoever else you are looking at, before you type an email address.
Plenty of sellers order tests that measure the amount without ever mentioning it, in exactly the way we did. If you find the weight on their report, that seller can answer the question. Ask them to put it on the page.
RT6423CP / RETA20-0803
If we only told you what our report covers, we would be doing the thing this page is complaining about.
RT6423CP and RETA20-0803. A certificate is a photograph of one
moment, not a promise about every vial that follows.What we can say is narrow and checkable: on this batch, both rows were measured, and both are printed above.
Run the five steps on whoever you are considering, then run them on us. The certificate is on the product page with the batch number and the verification code on it.
Every seller looks the same on the good day. Four things decide what happens on the bad one, and all four are published before you order if you go and read them.
Read the seller's own published pages, not their marketing, and none of these terms were written by us.
We will send the checking steps as a one page sheet, in plain language, so you can run them on any seller in any country, including the ones this site links to.
You are on the list.
The five steps come by email, as one page you can print.
Two reports, both rows, side by side.
It follows once our list is live, and nothing else is sent. We do not sell peptides and we are not going to email you about any.
One email with the sheet. Unsubscribe in one click. We do not share addresses.
Before you go
One sheet, in plain language, that you can run on any seller in any country. One column filled in from a published certificate, and one left empty for the seller you already have open.
You are on the list.
The sheet comes by email, as one page you can print.
Nothing else follows it. We do not sell peptides and we are not going to email you about any.
One email with the sheet. Unsubscribe in one click. We do not share addresses.