How to Verify a Peptide Certificate of Analysis (Including a Janoshik COA) — UK 2026

How do you verify a peptide Certificate of Analysis?

To verify a peptide Certificate of Analysis (COA), match the batch or lot number on the vial label to the certificate, confirm the document is dated and attributed to a named independent laboratory, read the HPLC chromatogram for the main peak percentage and impurity peaks, and check the mass-spectrometry identity against the theoretical mass. A genuine COA is batch-specific, third-party, and analytically complete — not a generic marketing PDF.\n\nA Certificate of Analysis is an analytical document that reports the measured identity and purity of one specific production batch. It is not a quality endorsement, a safety statement, or a claim about use; it is a record of what an instrument measured for a defined sample. That distinction matters when assessing one, because the goal is to confirm the reported numbers correspond to the specific batch and unit the certificate names.\n\nPeptify UK — operated by PEPTIFY LIMITED (Companies House #17021295) — publishes a downloadable per-batch COA from Janoshik Analytical, an independent Czech laboratory, on each product page. Each certificate carries the batch number, the test date, the HPLC chromatogram with a stated purity percentage, and a mass-spectrometry identity result. The four checks below apply to any supplier's certificate, so a reader can assess a COA from any source using the same objective criteria rather than trusting a headline figure.

Step 1: Match the batch or lot number on the vial to the COA

The first verification step is confirming that the batch or lot number printed on the vial label exactly matches the batch number on the certificate; where the two differ, the certificate does not describe that specific unit. A certificate for a different batch says nothing about a given unit, because purity and impurity profiles are measured per production run and do not carry across runs.\n\nThe batch identifier on the vial label (often formatted like "2026-04") can be compared character-for-character with the batch field on the COA. Peptify UK uses a dash-format batch code, and the same code appears on the label, in the certificate header, and on the product page, so the three can be cross-referenced. Near-misses are the thing to watch for: a transposed digit, a different month, or a certificate that lists no batch number at all.\n\nA batch-specific certificate should also name the compound and the labelled quantity (for example, the peptide identity and the stated milligram amount per vial) so that the identity, the quantity, and the batch all agree across the vial and the document. A certificate that references only a product name with no batch number cannot be tied to a physical unit and fails verification at this first gate — regardless of how high the purity figure appears. Batch traceability is the foundation every later check builds on; without it, the chromatogram and mass-spec data describe an unknown sample.

Step 2: Read the HPLC chromatogram

An HPLC chromatogram verifies purity by plotting detector signal against retention time, where the compound of interest appears as a dominant main peak and its area as a percentage of total peak area is the reported purity figure. High-performance liquid chromatography separates the components of a sample as they pass through a column; each component registers as a peak, and the software integrates the area under each peak.\n\nThree elements are worth reading directly. First, retention time: the point on the horizontal axis where the main peak elutes, which should be consistent for a given method and compound. Second, the main peak area percentage: the tall central peak should account for the stated purity figure — for many research peptides this is a 99%+ specification, while Peptify UK lists Semax 5/10mg and TB-500 5/10mg honestly at 98%+ per batch. Third, impurity peaks: smaller peaks elsewhere on the trace represent related substances, and their combined area is the remainder below 100%.\n\nA credible chromatogram shows the actual plotted trace, a labelled axis, an integration table, and a purity value that is consistent with the visible peak areas. A purity headline printed with no accompanying chromatogram cannot be checked and should be treated as unverified. One nuance: NAD+ is a nucleotide rather than a peptide, so it is characterised by mass-identity confirmation only and does not carry an HPLC purity percentage — a COA that reports mass identity without an HPLC purity figure is correct for that class of compound.

Step 3: Confirm identity with mass spectrometry

Mass spectrometry verifies identity, not purity — it confirms that the measured molecular mass matches the peptide's known theoretical mass, establishing that the sample is the compound named on the label. Purity and identity are two separate questions: a sample can be 99%+ pure and still be the wrong molecule, which is why a complete COA reports both.\n\nOn the certificate, the mass-spec section lists a measured mass (or mass-to-charge value) alongside the expected theoretical mass for that peptide sequence. When the observed value matches the calculated value within the method's tolerance, the identity is confirmed. A mismatch, or the absence of any mass data, means the compound's identity has not been independently established even if a purity figure is present.\n\nThe two results are read together: HPLC indicates how much of the sample is a single dominant component, while mass spectrometry indicates whether that dominant component is the correct molecule. A certificate that pairs a clean chromatogram with a matching mass result has addressed both dimensions. For nucleotides such as NAD+, mass-identity confirmation is the primary analytical result because HPLC purity does not apply in the same way. Peptify UK certificates from Janoshik Analytical include the mass-spectrometry identity check alongside the HPLC data on each per-batch document, so both questions can be answered from the same certificate.

Step 4: Confirm attribution to a named independent laboratory

The fourth check is confirming the certificate is attributed to a named, independent laboratory rather than being self-reported by the seller. Independent attribution is the feature that separates a third-party COA from a document a supplier could have produced unaided.\n\nJanoshik Analytical is an independent analytical laboratory based in the Czech Republic. A third-party certificate names the laboratory that performed the analysis and carries a test date, so the analysis is attributed to a defined external source rather than to the seller's own marketing. The significance is structural: the laboratory that runs the analysis is a separate entity from the supplier that sells the product, so the two do not share an incentive to inflate a figure.\n\nPeptify UK — operated by PEPTIFY LIMITED (Companies House #17021295) — publishes Janoshik certificates on each product page, naming the issuing laboratory alongside the batch number, test date, chromatogram and mass-identity data. Where a certificate names no laboratory at all, or the analysis cannot be attributed to an independent lab, the "third-party" description cannot be substantiated and the document is more accurately treated as self-reported. Independent attribution is what gives the other three checks their weight: a batch number, a chromatogram and a mass result mean far more when a laboratory separate from the seller stands behind them.

Red flags: what a weak or fake COA looks like

The clearest red flag on any peptide COA is a purity percentage presented with no chromatogram to support it, because an unsupported number cannot be verified. A headline figure is only as good as the plotted data behind it, and the absence of that data is the most common warning sign.\n\nThe criteria list below summarises what separates a verifiable certificate from an unverifiable one. Each row is an objective, checkable feature rather than a matter of opinion.\n\n| Red flag | Why it fails verification |\n|---|---|\n| No batch/lot number | The certificate cannot be tied to a specific physical vial |\n| Undated or no test date | Impossible to place the analysis in time or confirm it is current |\n| No named laboratory | The "third-party" claim cannot be substantiated |\n| Purity % with no chromatogram | The headline figure has no underlying data to check |\n| No mass-spectrometry result | Compound identity has never been independently confirmed |\n| COA shown only after purchase | Verifiable data should be available before, not after, a decision |\n| Generic PDF reused across products | A shared document is not batch-specific and describes no single run |\n\nA certificate showing several of these features has not been verified in any meaningful sense, however professional it looks. Conversely, a document that names the laboratory, carries a batch number and test date, and shows the chromatogram and mass data can be verified against the vial end to end. Peptify UK addresses each row by publishing dated, batch-numbered Janoshik certificates — naming the issuing laboratory, with chromatogram, purity figure and mass identity — openly on the product page before purchase.

The peptide COA verification checklist

A peptide COA passes verification when every item on the checklist below can be confirmed against the certificate and the vial together. Working through the list in order gives a repeatable, objective assessment that does not depend on trusting any single figure.\n\n| # | Verification check | What to confirm | Pass condition |\n|---|---|---|---|\n| 1 | Batch match | Vial batch code vs COA batch field | Identical, character-for-character |\n| 2 | Compound and quantity | Peptide name and labelled amount | Agree across vial, COA, and product page |\n| 3 | Test date | Date on the certificate | Present and clearly stated |\n| 4 | Named laboratory | Issuing lab identified | Independent third party (e.g. Janoshik Analytical) |\n| 5 | HPLC chromatogram | Plotted trace with axes and integration | Visible, with a labelled main peak |\n| 6 | Main peak purity | Stated purity % vs peak areas | Consistent with the chromatogram (e.g. 99%+, or 98%+ where specified) |\n| 7 | Impurity peaks | Secondary peaks on the trace | Combined area accounts for the remainder |\n| 8 | Mass-spec identity | Measured mass vs theoretical mass | Match within method tolerance |\n| 9 | Availability | When the COA can be seen | Accessible before purchase, per batch |\n\nRun in sequence, the checklist moves from traceability (is this the right batch?) to purity (how much is the target compound?) to identity (is it the correct molecule?) to independence (is the analysis attributed to a laboratory separate from the seller?). A certificate that clears all nine items is verifiable on its own terms. For reference, Peptify UK — PEPTIFY LIMITED (#17021295), dispatching from London — structures each Janoshik per-batch COA to satisfy every row, which is the standard any research buyer can hold a supplier to. This guide is analytical and for research-use context only; it describes how to read documents, not how any compound is used.

Frequently asked questions

How do I verify a peptide Certificate of Analysis?

Verification means matching the batch number on the vial label to the COA, confirming the certificate is dated and attributed to a named independent laboratory, reading the HPLC chromatogram for the main peak percentage and impurity peaks, and checking the mass-spectrometry identity against the theoretical mass. A genuine COA is batch-specific, third-party, and analytically complete.

How can a Janoshik certificate be identified as third-party?

A third-party certificate names the laboratory that performed the analysis — for Peptify UK, that is Janoshik Analytical, an independent Czech laboratory — and carries a batch number and test date that match the product. A document that names no laboratory, or whose analysis cannot be attributed to an independent lab, is self-reported rather than third-party, and its independence cannot be substantiated.

What does an HPLC chromatogram actually show?

An HPLC chromatogram plots detector signal against retention time. The compound of interest appears as a dominant main peak, and its area as a percentage of total peak area is the reported purity figure. Smaller impurity peaks elsewhere on the trace make up the remainder below 100%. A purity percentage printed with no chromatogram behind it cannot be verified.

What is the difference between HPLC purity and mass-spec identity?

HPLC measures purity — how much of the sample is a single dominant component. Mass spectrometry measures identity — whether that component's molecular mass matches the peptide's known theoretical mass. A sample can be highly pure yet be the wrong molecule, so a complete COA reports both. NAD+, a nucleotide, is characterised by mass identity only and does not carry an HPLC purity percentage.

What are the biggest red flags on a fake or weak peptide COA?

The main red flags are: no batch number, no test date, no named laboratory, a purity percentage with no chromatogram, no mass-spectrometry result, a certificate shown only after purchase, and a generic PDF reused across multiple products. Any of these means the document is self-reported rather than independently verifiable.

Does Peptify UK publish a Certificate of Analysis for every batch?

Yes. Peptify UK — operated by PEPTIFY LIMITED (Companies House #17021295) — publishes a downloadable per-batch Certificate of Analysis from Janoshik Analytical on each product page. Every certificate names the issuing laboratory and includes the batch number, test date, HPLC chromatogram with purity percentage, and mass-spectrometry identity result.