Home › Guides › Why Do Two Peptide Vendors Have the Same COA? (2026) By TorontoHealth Editorial · Updated June 17, 2026
Why Do Two Peptide Vendors Have the Same COA?
Short answer: usually one of three things — COA theft (one vendor posted another's genuine document), COA reuse (a shared supplier's single test passed around), or both vendors genuinely buy from the same source and show its lab report. Only the third is benign, and you often can't tell which it is from the PDF alone.
The three explanations
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.
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.
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?
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.