Knowing how to verify a peptide COA is the single most practical skill a researcher can develop before ordering from any vendor. A Certificate of Analysis is only useful if you can read it critically — not just confirm it exists. This guide walks through each component of a legitimate COA, explains what the numbers mean, and covers the specific checks that separate real documentation from fabricated reports.
Most researchers glance at the purity percentage and move on. That’s not verification. Real verification means matching the batch identifier on the document to the product label, understanding what the analytical method can and cannot confirm, and knowing which red flags to look for in the formatting and figures themselves.
What a Legitimate Peptide COA Contains
Before walking through the verification steps, it helps to know what a complete COA looks like. Missing any of these elements doesn’t automatically mean the document is fake, but it does mean you have incomplete analytical data.
- Laboratory name and address: The issuing lab should be identifiable. Janoshik Analytical in the Czech Republic is the most widely used third-party lab in the research peptide space.
- Sample identification: The vendor name, compound name, lot or batch number, and an internal sample ID.
- Test date: The date the analysis was performed. This should be plausible relative to when the product became available from the vendor.
- Analytical methodology: HPLC (high-performance liquid chromatography) for purity, LC-MS (liquid chromatography-mass spectrometry) for identity. A COA with only one method gives partial information.
- Purity result: Expressed as a percentage. For research-grade peptides, results above 98% by HPLC are typical from reputable suppliers.
- Identity confirmation: The MS result should confirm the molecular mass of the stated compound. This is the piece that verifies you’re not looking at a substitute or contaminated sample.
- A traceable reference number: For Janoshik, this is a task number that ties the document to a specific submission in their records.
Step-by-Step: How to Verify a Peptide COA
Step 1: Match the Batch Number
The first thing to check is whether the batch or lot number on the COA matches the batch number on the product label or shipping documentation. This is the core of match-batch COA verification.
A COA without a batch number, or a COA where the batch number doesn’t appear on the product, cannot be verified as applicable to your specific vial. The analytical data may be real, but it’s evidence about a different lot of material.
Many vendors display a COA that was tested once on an initial batch and then reused for all subsequent stock. This is technically documented but practically unverifiable for any specific order. If you can’t match the numbers, you have no way to confirm the COA applies to what you received.
Step 2: Check the Test Date Against Product Availability
Look at when the COA was issued relative to when the vendor started selling the product. A COA dated two years before a vendor’s website went live is a red flag. It suggests either the vendor purchased old inventory or the date has been altered.
Test dates in the future are an obvious fabrication signal. Test dates that predate the stated compound’s commercial availability are also worth questioning (some research peptides have narrow windows of widespread availability).
Step 3: Read the HPLC Data, Not Just the Summary
Most COAs include a purity percentage prominently, but the underlying chromatogram data tells you more. In the Janoshik report format, the HPLC section lists each detected peak with its area percentage. The main peak corresponds to the target compound; smaller peaks correspond to impurities or related compounds.
Things to look for in the HPLC data:
- The main peak area percentage should match the stated purity. If the report says 99.1% purity but the chromatogram shows the main peak at 97.8%, something doesn’t add up.
- The sum of all peak percentages should be close to 100%. If they sum to 85% or 115%, the report has a formatting or calculation error that warrants a question to the vendor.
- Retention time should be plausible. HPLC separates compounds by how long they take to pass through the column. For a given method, the same compound should elute at a consistent retention time. This is hard to verify without knowing the specific method parameters, but extreme outliers (retention times of 0.1 minutes or 60+ minutes for typical peptides) are anomalous.
Step 4: Confirm Identity via the Mass Spec Result
The MS section of a COA reports the detected molecular mass. Every compound has a specific molecular weight determined by its amino acid sequence. You can look up the theoretical molecular weight of any research peptide through published biochemical databases or the vendor’s product page.
The MS result should match the theoretical molecular weight within about 1 Da (dalton). Charge state variants appear at fractions of the molecular weight (the [M+2H]2+ ion of a 3,000 Da peptide appears at roughly 1,500 Da), which is normal and not an error. What’s not normal is a detected mass that doesn’t correspond to any known ion of the stated compound.
Step 5: Evaluate the Document Formatting
Fabricated COAs often have tells in their appearance. These aren’t definitive on their own, but they’re worth noting:
- Inconsistent fonts, spacing, or formatting within the same document (suggests editing)
- Round-number purity figures (exactly 99.0%, exactly 100%) rather than realistic decimal results
- Lab logos or headers that don’t match the lab’s actual branding
- Test dates formatted differently in different sections of the same document
- The same task number appearing across multiple different products or batches from the same vendor
None of these alone proves falsification, but multiple anomalies in the same document should prompt direct inquiry to the lab.
Step 6: Cross-Reference Published COA Data
Some vendors publish their COAs publicly on dedicated lab results pages. This is the most transparent approach because it allows researchers to cross-reference batch-level data independently.
Bastion’s Lab Results page lists COA entries by compound and lot. Each entry shows the purity result, analytical method, and Janoshik task number. When you receive an order, you can match your vial’s batch code to the corresponding entry on that page.
Janoshik Task Numbers: What They Are and Aren’t
Janoshik Analytical assigns each submission a unique task number. This number appears on the COA and is often cited as proof of authenticity. The task number is traceable within Janoshik’s internal laboratory management system, which means Janoshik themselves can confirm whether a given task number corresponds to a real submission.
What a task number doesn’t provide is a public verification portal. Unlike some certification systems, there’s no URL where a buyer can type in a task number and retrieve the original data. To verify a task number, you would need to contact Janoshik directly and provide the number along with a description of what you’re trying to confirm.
The practical implication: a Janoshik task number is a useful authenticity signal (fabricating a specific task number is harder than fabricating an image), but it’s not independently verifiable by a buyer in real time. The batch number match between the COA and your product label is the check you can actually perform without lab contact.
When to Request Additional Documentation
If the COA doesn’t include an MS identity check, you have purity data but no identity confirmation. For critical research applications, it’s reasonable to ask the vendor whether an MS report is available or whether additional testing can be arranged.
If the batch number on your vial doesn’t match any COA on the vendor’s lab results page, contact the vendor before proceeding. Legitimate vendors can provide the applicable COA quickly; a vendor who can’t produce matching documentation for a specific lot should prompt careful consideration.
If you have questions about COA interpretation or need help matching a batch code to a specific COA entry at Bastion, the Help page covers the most common inquiries. Direct contact via the contact form is available for batch-specific questions.
Frequently Asked Questions
What is the difference between HPLC and LC-MS on a peptide COA?
HPLC (high-performance liquid chromatography) measures purity by separating the components of a sample and measuring what proportion of the detected material is the target compound. LC-MS (liquid chromatography combined with mass spectrometry) adds molecular identity confirmation by detecting the molecular mass of the compound. HPLC tells you how pure the sample is; LC-MS tells you what the compound actually is. Both together give a more complete picture than either alone.
Can I verify a Janoshik COA on their website?
Janoshik Analytical doesn’t maintain a public lookup portal where buyers can independently retrieve task data by number. The task number is an internal reference that Janoshik can confirm, but this requires contacting the lab directly rather than a self-service check. What you can verify independently is the batch number match between the COA document and your product label.
What purity level should a research peptide have?
Research-grade peptides from established suppliers typically test at 98% or higher purity by HPLC. Some compounds show natural variation across lots, and results in the 97-99% range are common and acceptable for most research applications. Results below 95% are worth noting, and results claiming exactly 100% purity are biologically unrealistic (some impurity trace is always present in real samples).
What if the batch number on my vial doesn’t match the COA?
Contact the vendor before using the product. Either the COA on the vendor’s website needs updating to include your lot, or there was a documentation error. A legitimate vendor can produce the correct COA for your specific batch. If the vendor can’t match your lot to a COA, that’s a significant quality control concern.
Is a COA the same as a certificate of conformance?
No. A Certificate of Conformance (CoC) is a vendor-issued document stating that a product meets specified requirements, typically without including the underlying analytical data. A COA is an analytical report from a testing lab that includes the actual results (chromatogram data, mass spec results, purity figures). For research purposes, a COA from a third-party lab is substantially more verifiable than a CoC from the vendor.
How do I know if a COA has been altered?
No single check confirms a COA is authentic, but a combination of signals helps. Check for inconsistent formatting within the same document, round-number purity figures (exactly 99.0% or 100.0%), test dates that predate the compound’s commercial availability, and the same task number on multiple different products. For high-stakes research, contacting the testing lab directly is the most reliable verification. When verifying Bastion documentation, all COA entries on the lab results page correspond to actual Janoshik submissions.