Why Do Two Peptide Vendors Have the Same COA?

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The three explanations

1. Theft. A vendor downloads a competitor's (or their supplier's) real COA and presents it as their own. The document is authentic — it's just not theirs. Posting a real PDF only defeats forgery; it does nothing against theft.
2. Reuse. A Chinese supplier tests one batch, and every reseller buying from that supplier shows the same report — even though their individual vials were never tested. One good test, thousands of untested vials sold against it.
3. Same genuine source. Sometimes it's innocent: both vendors really do resell the same tested product. But you can't assume this.

How to tell the difference

The PDF won't tell you — but these will:

• Does each vendor's COA verify on the lab's own portal, tied to that vendor as the client?
• Does the client name on the document actually match the vendor showing it?
• Is there any independent blind testing of either vendor's actual product?

The full method is in how to read a peptide COA.

The takeaway

Two vendors with the same COA is a yellow flag, not automatically fraud — but it means the document isn't doing the job people think it is. A COA proves a test happened on some sample. Whose sample, verified where, is the real question.

Telling the three cases apart

Go to the laboratory's own portal and look the report up. The record's client field settles most of it. If it names a supplier that neither vendor is, both vendors are showing an upstream report, which is reuse: common, not dishonest in itself, and not evidence about either vendor's fills. If it names one of the two vendors, the other has posted a document that is not its own, which is theft. If the record does not exist on the laboratory's site at all, the document may be a fabrication and neither vendor's copy is evidence of anything. The PDF looks identical in all three cases; the lookup does not.

Why reuse is the common case

A small number of synthesis houses supply most of the resellers in this category. A house tests a bulk batch once and passes the report to every buyer of that batch. Each reseller fills its own vials and shows the same report. So two vendors with the same certificate often do share a source, and the certificate is genuine, and it still describes bulk material before either vendor touched it. The buyer's question is not “is this report real” but “did this vendor test its own fill”, and the answer is a second report, in the vendor's own name, on the batch it actually shipped.

What to ask each vendor

“Is this report for the batch you are shipping now, and did you commission it?” A vendor that tested its own fill answers with its own laboratory reference. A vendor that passes along a supplier's report will say so if asked directly, and that answer is fine as far as it goes: it means the vendor is honest about the provenance and the product is untested after filling. The vendor to avoid is the one that presents an upstream report as its own commission, because that is a small lie about documentation from a party you are trusting on everything else.

Dates and batches as a tie-breaker

When two vendors show one report, compare the report's date with each vendor's batch labelling. A report older than a vendor's batch cannot describe it. A report on a batch identifier that one vendor's labels carry and the other's do not tells you which vendor's product the sample came from. These checks are imperfect — labelling conventions vary — but they are quick, and they often resolve a case the portal lookup leaves open.

The honest version of sharing a source

Some vendors say plainly that they resell a named supplier's material and show that supplier's report as the supplier's. That is transparent and it is not the same as testing. A buyer who wants a report on the vial they will receive should look for the vendor that adds its own, and should expect to pay a little more for the difference, because the difference is a real cost the vendor chose to bear.

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About the vendor

Growth Guys publishes 244 third-party lab reports through Janoshik Analytical, averaging 99.03% purity across the 181 that state a figure (range 93.844% to 99.99%). Each links to the testing lab's own domain rather than a PDF hosted by the seller. It ships domestically inside Canada, priced in Canadian dollars, and has answered publicly in its own vendor threads since November 2021. Full breakdown of every report, including the ones that came in lower.