How to Detect a Fabricated Peptide COA

Problem definition

A Certificate of Analysis (COA) is only useful when it describes a real sample from a real batch, tested by a real laboratory under a defined method. Fabricated or recycled COAs are common enough in research peptide trade that document review should be a formal step, not a quick glance at a purity percentage.

This guide focuses on procurement document control. It does not teach medical use, dosing, or reconstitution for human administration.

What a usable COA should contain

At minimum, look for:

• - Laboratory legal name and address
• - Report number
• - Sample ID / batch or lot number
• - Sample description and received condition
• - Received date and analysis date
• - Method and instrument notes
• - Result, unit, and specification (if claimed)
• - Authorized signatory
• - Accreditation mark and, when available, a verification URL
• - Raw chromatogram or spectrum attachments

If several of these fields are missing, treat the document as incomplete rather than "approved."

Red-flag checklist

Identity and entity mismatches

• - Quoting company name ≠ COA customer or manufacturer name
• - Lab name cannot be found in the accreditation body's directory
• - Certificate number is blank, blurred, or reused across products

Sample and date problems

• - No sample ID or lot number
• - Lot on COA does not match vial label or invoice
• - Analysis date is earlier than production or packing date claimed elsewhere
• - Report date is far older than the offered stock with no retest rationale

Analytical presentation problems

• - HPLC image without integration table or peak list
• - MS image with no sample ID, method, or observed mass annotation
• - Only a screenshot of a result table
• - Multiple suppliers share an identical chromatogram file

Accreditation problems

• - Accreditation mark present, but scope does not cover the method or matrix
• - Certificate expired
• - Contact email uses a free mailbox unrelated to the laboratory domain

How to verify the laboratory, not just the PDF

1. Read the laboratory legal name exactly as printed. 2. Note the accreditation body and certificate number. 3. Search the official directory (ILAC path → national body → lab entry). 4. Confirm the certificate is current. 5. Download or open the Schedule / Scope of Accreditation. 6. Check that method family, tested items, and site address fit the report.

A laboratory may be accredited while a specific peptide assay sits outside its accredited scope. Always review the current scope document. See How to verify a laboratory and Official resources.

Practical review workflow for buyers

1. Save the COA with a filename that includes supplier slug + lot + date. 2. Compare lot numbers across COA, packing list, invoice, and vial photo. 3. Check whether purity is reported as area percent, content assay, or an undefined "purity." 4. Ask for raw data when the commercial risk is material. 5. Send a retained sample to an independent lab before first scale-up.

What fabricated COAs usually try to sell

• - Guaranteed 99% purity for every catalog item
• - Instant "FDA / GMP / ISO approved product" language without entity match
• - Pressure to pay before document sharing
• - Refusal to provide chromatograms or scope references

None of those behaviors prove the material is genuine. They only increase documentation risk.

Related pages

• - How to read a COA
• - Peptide content vs purity
• - Testing checklist
• - Request supplier matching