AIX_How_to_Read_a_Peptide_COA_Slide_Deck (1)
                     I N D E P E N D E N T  E D U C ATI O N AL  R ES O URC E
RESEARCH & BUYER EDUCATIO N GUIDE   ·   AUGUST  2 026  EDIT IO N
How to Read a Peptide Certificate of 
Analysis & Lab Report
Plus: How to Tell If a Peptide Supplier Is Legit or a Scam in Canada
A field guide to HPLC purity, mass-spectrometry identity confirmation, and the twelve red flags that separate a genuine 
third-party lab report from a fabricated one.
HPLC & LC-MS ICP-MS Heavy Metals LAL Endotoxin Legit vs. Scam Signals Health Canada Advisory RA-81874
PUB LISHED BY SCOP E
AIX Peptides Education  ·  aixpeptides.com/coa Research-use-only reference material — not health or dosing guidance
CO N T E N TS
Twelve Sections, Start to Finish
01 What a COA Actually Is 07 Reading a Blend COA
02 Anatomy of a COA 08 The Two-Certificate Standard
03 HPLC Purity, Explained 09 Verifying a Report Independently
04 Mass Spectrometry & Identity 10 Red Flags: Legit vs. Scam
05 Content & Net Peptide Assay 11 The Canadian Regulatory Picture
06 Beyond Purity 12 Glossary & Checklist
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BE F O R E  YO U  B EG I N
Why This Guide Starts With Paperwork, Not Products
Learning to tell a legitimate peptide supplier from a scam in Canada starts with 
the one document nearly every seller shows you — and almost no buyer 
actually reads properly: the Certificate of Analysis. 1 doc.
The single document this entire guide is about — 
A polished website, fast shipping, and confident marketing copy are trivial to fake. A 
and the one almost no buyer reads properly 
genuine, verifiable, lot-matched COA is not — which is exactly why it's the single strongest before trusting a supplier.
signal available to a researcher deciding whether a supplier is trustworthy.
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PA R T  O N E
The Science of a COA
Sections 01–07 — what HPLC, mass spectrometry, and the other tests on a Certificate of Analysis actually measure.
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SEC TI O N  0 1
What a Certificate of Analysis Actually Is
And why a single purity percentage, on its own, tells you almost nothing about what's in the vial.
1 sample.
A Certificate of Analysis — COA for short — is a laboratory report generated after a 
chemist runs a specific batch of material through analytical instruments and writes down 
what came out. It is not a certification or a regulatory approval. It's a snapshot of what 1 lot.
one lab measured, on one day, from one sample pulled out of one production lot. A COA does not test every vial in a batch. The lot 
number on the certificate matching your vial label 
is the thread connecting the paperwork to the 
material in your hand.
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SEC TI O N  0 1
Two Separate Questions, One Document
A complete COA answers both — and it's worth holding them apart in your head.
QUESTION ONE QUESTION TWO
How pure is it? Is it even the right molecule?
What percentage of the sample is the intended peptide versus Purity and identity are not the same measurement. A sample can be 
everything else — impurities, by-products, solvent, or moisture? This is 99.5% pure and still be the wrong compound — pure, but wrong. Mass 
what HPLC measures (Section 03). spectrometry confirms identity (Section 04).
A COA reporting only one of these is incomplete by definition, no matter how impressive the number looks.
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SEC TI O N  0 2
Anatomy of a Certificate of Analysis
Eight fields a legitimate report always contains.
1 COMPOUND The specific product & salt form — free-base and acetate/TFA forms have different molecular weights.
2 BATCH / LOT NO. Must match the number printed on your physical vial — the single strongest link to the material.
3 TEST LAB Named and independently verifiable — not just a logo on a PDF.
4 TEST METHODS At minimum RP-HPLC (purity) and ESI-MS (identity).
5 TEST DATE Dated, and recent relative to the vial's manufacture date.
6 HPLC RESULT Purity % with the chromatogram image included — not just the number.
7 MS RESULT Observed mass vs. theoretical mass, with a stated tolerance.
8 DISPOSITION Pass / Fail against a stated specification, signed.
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SEC TI O N  0 2
What a COA Is Not
✕ Not a Health Canada or FDA approval — approval evaluates a finished product; a 
COA evaluates a chemical sample.
✕ Not proof of sterility unless sterility/endotoxin testing is specifically included 
(Section 06). 4
✕ Not applicable to a different lot, even from the same vendor.
✕ Not identity confirmation on its own — purity without mass spec can't rule out specific, common misreadings of what a 
COA actually proves — covered one by one 
“clean, but wrong molecule.”
in this section.
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SEC TI O N  0 3
HPLC Purity, Explained
Reading a chromatogram the way an analyst does — not just reading the number underneath it.
TARGET PEPTIDE — 99.42%
High-Performance Liquid Chromatography (HPLC) is the workhorse method for peptide 
purity. A liquid sample is pushed at high pressure through a narrow column, and different 
molecules travel through it at different speeds. A detector records what comes out and 
when — the result is a chromatogram, where each component shows up as its own peak.
For peptides, the near-universal standard is reverse-phase HPLC (RP-HPLC) on a C18 column, with Retention time →
Two small impurity peaks (0.31% / 0.27%) — this is what a clean single-peptide result 
UV detection — typically at 214nm, the wavelength the peptide bond itself absorbs. looks like.
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SEC TI O N  0 3
What Counts as an Acceptable Purity Threshold
Reported HPLC Purity What It Generally Indicates
≥ 99% Standard release threshold for most reputable research-grade vendors.
95% – 98% May suit preliminary screening; inadequate for quantitative or publication-grade work.
< 95% Generally considered inadequate for reproducible research use, regardless of price.
Exactly 99.00% Suspiciously round — real chromatographic integration rarely lands on a perfectly clean number.
Purity is only meaningful in context of how it was measured — the chromatogram and method are not optional extras.
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SEC TI O N  0 4
Mass Spectrometry & Identity Confirmation
Why “99% pure” and “the right molecule” are two different claims.
HPLC tells you how clean a sample is — not what the clean thing actually is. A different 
peptide with similar polarity can elute at a similar retention time and look, to HPLC 
alone, indistinguishable from the intended compound. ±3 Da
In electrospray ionization (ESI) mass spectrometry, the observed mass is compared against the A “±0.1%” mass tolerance sounds tight but on a 
theoretical mass calculated from the peptide's known sequence. If the two match within 3,000 Da peptide allows roughly this much 
variance — enough to hide a single incorrect 
tolerance, identity is considered confirmed.
amino acid.
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SEC TI O N  0 4
Special Cases Worth Knowing
✓ Copper-coordinated peptides (such as GHK-Cu) have a molecular weight that includes the bound copper ion — tested against 
the correct complex, not the free peptide.
✓ Salt forms — acetate, TFA, free-base — shift the measured mass; a competent lab accounts for this rather than flagging a 
false mismatch.
✓ Tandem MS (MS/MS), where available, fragments the molecule to help confirm sequence, not just overall mass — the 
strongest identity evidence available.
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SEC TI O N  0 5
Content & Net Peptide Assay
The question neither HPLC nor mass spectrometry answers: how many milligrams are in the vial?
HPLC purity tells you what fraction of the material that eluted was the target peptide. 
Mass spectrometry tells you it's the correct molecule. Neither tells you how many Purity ≠ 
milligrams of peptide are actually in the vial.
Quantity
“Net powder weight” is not the same claim as 
That's a separate measurement — content or assay — because lyophilized powder is rarely “net peptide content.” Ask for the assay result 
specifically if a milligram claim matters.
100% peptide by weight once counter-ions and residual moisture are accounted for.
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SEC TI O N  0 6
Beyond Purity: The Tests Most Vendors Skip
Heavy metals, endotoxin, sterility & residual solvents — the second tier of testing.
Test Method Standard Screens For
Heavy metals ICP-MS USP / Trace arsenic, lead, cadmium, mercury from raw materials or reagents.
Endotoxin LAL / rFC USP  Bacterial endotoxin, reported in EU/mg against a stated limit.
Sterility Compendial test USP  Viable microorganisms — a validated 14-day incubation test.
Residual solvents GC / GC-MS ICH Q3C Leftover synthesis solvents (TFA, acetonitrile, DMF).
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SEC TI O N  0 7
Reading a Blend or Multi-Peptide COA
Every question in this guide multiplies once a vial contains more than one peptide.
✓ A separate HPLC purity figure for each individual peptide — not one combined 
number.
✓ A separate MS identity confirmation for each peptide — each has its own molecular 
weight. ?
✓ A stated ratio or per-component quantity by weight, not just a list of ingredient 
names. “How much of each individual peptide is 
actually in this vial?” If a blend COA can't 
answer that, it isn't fully characterised.
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PA R T  T W O
Verification & Red Flags
Sections 08–11 — how to independently check a report, and the specific signs that separate a legitimate supplier from a scam.
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SEC TI O N  0 8
The Two-Certificate Standard
Manufacturer COA vs. independent third-party COA — why relying on only one is weaker.
MANUFACTURER COA THIRD-PARTY COA
What it's good for What it's good for
Confirms what left the synthesis facility, tied to internal batch records Confirms what an unaffiliated lab found testing the same lot — paid 
and raw-material traceability. Produced by an interested party. the same fee whether the sample passes or fails.
Together, the two are genuinely harder to falsify than either alone — a discrepancy between them is itself a meaningful signal.
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SEC TI O N  0 8
When the Two Certificates Disagree
✓ A purity difference of a few tenths of a percentage point, with both clearing spec, is unremarkable — normal instrument 
variance.
✕ A gap large enough that one report passes and the other fails the same spec is a genuine discrepancy worth resolving 
before use.
✕ A mass-spec identity mismatch between the two — not just a purity gap — points toward a batch or documentation issue, 
not routine variance.
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SEC TI O N  0 9
Verifying a Report Independently
A PDF, on its own, is just a file. Here's how to check it against a source the vendor doesn't control.
1 Find the report ID printed on the certificate, often near a QR code.
2 Go to the lab's own verification page directly by typing the URL yourself — never click a link inside the PDF.
3 Compare four fields compound, batch/lot, purity result, and test date against the public record.
4 Match the lot number on the public record to the lot number on your physical vial.
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SEC TI O N  0 9
Verify the Lab Itself, Not Just the Report
Search the testing laboratory's name on its own, separately from anything the vendor provided. A legitimate lab has an independent website and a 
visible track record — a lab name with no independent presence outside the vendor's materials is a red flag on its own.
A SUPPLIER-LEGITIMACY SIGNAL WORTH CHECKING
Does a Canadian peptide seller publish a public, batch-indexed COA library — or only send documents on request after purchase? A small but growing number 
of sites maintain a dedicated COA hub cross-referenced by lot number, which at minimum shows a willingness to be checked. Publishing documentation isn't 
proof of quality on its own, but refusing to is a meaningful absence.
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SEC TI O N  1 0
Red Flags: Legit Supplier vs. Scam (1 of 2)
Specific, checkable signs a COA is fabricated, reused, or incomplete.
✕  No named testing lab ✕  Missing batch/lot number ✕  No chromatogram image
Cannot be independently verified by definition — The document proves nothing about the vial in your A bare percentage with no supporting trace is a claim, 
disqualifying on its own. hand. not a result.
✕  No mass spec / identity data ✕  Suspiciously round purity ✕  Wide mass tolerance
Purity without identity can't rule out “clean, but wrong An exact “99.00%” rarely reflects real chromatographic “±0.1%” can hide several Daltons of variance on a larger 
molecule.” integration. peptide.
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SEC TI O N  1 0
Red Flags: Legit Supplier vs. Scam (2 of 2)
✕  Chromatogram is “too clean” ✕  Identical template across products ✕  Old test date vs. fresh vial
Zero baseline noise can indicate a generated or reused One layout reused across compounds, only the numbers Doesn't reflect the batch actually in your hand.
image. swapped.
✕  Report ID doesn't resolve publicly ✕  Reluctance to document on request ✕  Several flags together
If the lab has a verification tool and the ID returns A reputable vendor answers testing questions without One gap is a question. Multiple flags plus evasiveness is 
nothing, it's unverified. friction. a pattern.
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SEC TI O N  1 0
What a Trustworthy COA Looks Like
The green-flag checklist — every item should be checkable, not just claimed.
✓  Named, searchable lab ✓  Lot number matches your vial ✓  HPLC + MS reported together
Findable through your own search, independent of the The strongest single link between paperwork and Cleanliness and identity answered as two complete 
vendor. material. results.
✓  Actual chromatogram image ✓  Publicly verifiable report ID ✓  Two certificates, one lot
You see the underlying data, not just a summary Resolves against the lab's own database. Manufacturer + independent third-party, per Section 08.
number.
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PA R T  T H R E E
The Canadian Picture & Reference
Sections 11–12 — the regulatory backdrop, a glossary, and a printable verification checklist.
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SEC TI O N  1 1
The Canadian Regulatory Picture
A clean COA is evidence about chemical contents. It is not evidence of regulatory authorization.
HEALTH CANADA PUBLIC ADVISORY  ·  REFERENCE RA-81874  ·  ISSUED APRIL 9, 2026
Peptides are generally regulated as prescription drugs in Canada, and a product labelled “Research Use Only” is not made legal for human use by 
that label. Authorized prescription drugs carry an eight-digit Drug Identification Number (DIN) — research peptides sold under RUO framing do not, 
because they are not authorized as drugs for human use.
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SEC TI O N  1 1
Enforcement Is Active, Not Theoretical
Over 2026, Health Canada took visible, escalating enforcement action against unauthorized 
injectable peptide retailers — including a permanent injunction granted by the Superior 
Court of Québec in June 2026 against a retailer that continued selling unauthorized products 3
despite prior ministerial orders.
separate questions to keep apart: chemical 
identity, regulatory authorization, and sport 
Separately, WADA's Prohibited List bans most research peptides under S2 or the S0 catch-all, at all 
eligibility.
times. A verified, high-purity COA has no bearing on WADA eligibility — chemistry and sport-
governance are separate questions.
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SEC TI O N  1 2
Quick Glossary
The key terms from this guide, defined in one line each.
HPLC LAL / rFC
Separates sample components to measure relative purity. Assays for detecting bacterial endotoxin (USP ), in EU/mg.
MS / ESI USP 
Mass spectrometry (electrospray ionization) — confirms identity. Governs sterility testing, including the 14-day incubation standard.
Da (Dalton) ISO/IEC 17025
The standard unit of molecular mass in MS results. The international standard for lab testing accreditation.
Content / Assay RUO
How much peptide (by weight) is present — distinct from purity %. Research Use Only — describes intended use, not regulatory approval.
ICP-MS DIN
Quantifies trace heavy-metal contamination (USP /). Drug Identification Number on Health Canada-authorized drugs.
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SEC TI O N  1 2
COA Verification Checklist
Run through this for every batch, every order.
Lot number matches the vial in hand Blends: every component has its own purity, identity & quantity
Testing lab is named and independently searchable Test date is recent relative to manufacture date
HPLC purity reported with the chromatogram image Report ID resolves in the lab's public verification database
Purity meets your required threshold, not suspiciously round Both manufacturer & independent third-party COA available
Mass spec identity confirmation present (observed vs. theoretical) Heavy metals / endotoxin / sterility data available if relevant
Content/assay reported if a milligram claim matters Vendor provided documentation without friction
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BE F O R E  YO U  G O
Five Things to Remember
1
A COA is lot-specific, date-specific, and method-specific — treat it that way.
2
Purity (HPLC) and identity (mass spec) are two different claims. Both are required.
3
Purity is not quantity — content/assay is a separate measurement.
4
Two certificates — manufacturer and independent — beat one.
5
A clean COA proves chemistry, not regulatory approval or sport eligibility.
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K E E P  LEA R N I N G
Verification Is a Habit, Not a One-Time Check
Every point in this guide comes back to the same idea: a Certificate of Analysis is only as strong as your ability to check it against something 
the seller doesn't control — a public lab database, a matching lot number, a second independent report.
FURTHER READING
COA & Lab Results Hub  —  aixpeptides.com/coa
aixpeptides.com
Full downloadable PDF guide with a printable checklist
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SCOPE & DISCLAIMER
This is an educational reference on analytical documentation, not a health, dosing, or human-use guide. Research peptides are intended strictly for laboratory and 
in-vitro research use by qualified researchers, not for human or animal administration.
Research peptides are not approved by Health Canada or the FDA for human or veterinary use. Health Canada's April 9, 2026 public advisory (reference RA-81874) 
states that “Research Use Only” labelling does not make a product legal for human use, and that peptides are generally regulated as prescription drugs in Canada.
All chromatograms, certificates, and lot numbers shown in this guide are illustrative mock-ups built for teaching purposes — not scans of real laboratory reports.
aixpeptides.com  ·  aixpeptides.com/coa  ·  Published by AIX Peptides Education
© 2026 AIX Peptides. Educational reference material.