During our routine vendor evaluation process, we have identified multiple instances of vendors providing Certificates of Analysis that appear to be fabricated, templated, or misleading. This is not an edge case. Based on our analysis, a meaningful percentage of COAs circulating in the research peptide market do not represent genuine analytical testing.
What We Found
Our investigation focused on COAs from vendors that showed suspicious patterns during our standard review process. We cross-referenced the claimed testing data against our own independent laboratory results and examined the documents themselves for signs of fabrication.
Template COAs
The most common issue we encountered was templated documents. These are COAs where the vendor clearly uses the same document layout with only the peptide name, batch number, and a few values swapped out. While using a consistent template is not inherently problematic, the issue arises when the analytical data appears to be fabricated rather than measured.
In several cases, vendors used identical HPLC chromatogram images across different peptides. This is physically impossible. Different peptides have different retention times, different peak shapes, and different impurity profiles. If two COAs for two different peptides show the same chromatogram, at least one of them (and likely both) is fabricated.
Suspiciously Uniform Data
We identified vendors whose COAs consistently reported purities within an implausibly narrow range across all products and all batches. One vendor showed 98.5% to 99.1% purity for every peptide in their catalog, with no variation across batch numbers spanning months of production. Real analytical chemistry does not produce this kind of uniformity. Different peptides synthesized at different times should show meaningful variation in their purity profiles.
Non-Existent Laboratories
Several COAs referenced testing laboratories that we could not verify. The lab names appeared on no accreditation registries, had no web presence, and no phone numbers that connected to a real facility. When we reached out to vendors about this, responses ranged from deflection to providing a different lab name that also could not be verified.
Metadata Red Flags
Examining the digital properties of COA PDF files revealed additional concerns. In multiple cases, COA documents that claimed to be from professional laboratories were created using consumer image editing software. Some had creation dates that predated the batch manufacturing dates listed on the document. Others contained embedded text layers that did not match the visible content, suggesting that values had been edited after the original document was created.
How to Protect Yourself
Cross-Reference the Lab
If a COA names a testing laboratory, look them up. Legitimate analytical labs have websites, accreditations (ISO 17025 is the relevant standard for testing laboratories), and verifiable contact information. If you cannot find the lab, the COA should be treated with skepticism.
Compare Across Products
If you order multiple peptides from the same vendor, compare the COAs side by side. Different peptides should show different retention times, different mass spec values, and different impurity profiles. If the documents look like copies of each other with a few numbers changed, that is a significant warning sign.
Request the Chromatogram
A numerical purity value without a supporting chromatogram is an unverifiable claim. Ask for the raw HPLC trace. Legitimate vendors who conduct real testing will have this data readily available. Those working from templates typically will not.
Check for Batch Specificity
Every COA should reference a unique batch or lot number that matches the label on your product. If the batch number on the COA does not match your vial, or if no batch number is present at all, the document is not specific to your product and may not reflect its actual quality.
Use Independent Testing Resources
Platforms like PeptideWatchdog exist specifically to provide independent verification. Rather than relying solely on vendor-provided documents, check whether the vendor has been independently tested. Our lab scores, community reviews, and historical test data offer a more complete picture than any single COA.
The Bigger Picture
Fake COAs undermine trust across the entire research peptide industry. They make it harder for honest vendors to differentiate themselves and create an environment where marketing claims replace genuine quality. When a vendor invests in real third-party testing and transparent documentation, they should be recognized for that investment. When a vendor fabricates their analytical data, researchers deserve to know.
This is why COA accuracy is a scored component of our vendor grading system. We compare what vendors claim against what our testing actually finds. The gap between those numbers tells a story, and we report it publicly so you can factor it into your purchasing decisions.
If you encounter a COA that you believe may be fabricated, we encourage you to submit it through our community reporting system. Every data point helps us build a more accurate picture of vendor quality across the market.