Peptide Verification
What Should a Peptide Certificate of Analysis Show?
Learn which details to check on a peptide certificate of analysis, including the lot number, test methods, results, and laboratory information.
Short answer. A real certificate of analysis names the product and grade, the batch or lot number, the release date and the expiry or retest date, every test performed with its method, acceptance limit and numerical result, the date and signature of the quality unit, and the name, address and phone number of the manufacturer or testing lab. Anything missing is a question, not a formality.
What this means for your clinic. Read every certificate against a fixed list of fields, the same list every time, and record which fields are present. A certificate that is missing a lot number, a method or a signature has not failed a test; it has failed to be a certificate.
Which fields does every real certificate carry?
There is no single law that defines a peptide certificate, but two documents come close, and the clinic’s guide to verifying peptides uses both as the yardstick. ICH Q7, the international good manufacturing practice guide for active ingredients, sets out what a certificate of analysis should contain in sections 11.41 to 11.44: the name of the material and its grade where relevant, the batch number, the date of release, the expiry date or retest date where one exists, each test performed with its acceptance limits and numerical results, a date and a signature from authorized quality personnel, and the name, address and telephone number of the original manufacturer. Where a repacker, agent or broker issues a new certificate, it must also name the laboratory that did the testing and attach a copy of the original manufacturer’s certificate.
The US dietary supplement rule adds the plainest statement anywhere in federal regulation of what makes a certificate usable. Under 21 CFR 111.75(a)(2)(ii)(B), a buyer may rely on a supplier’s certificate only if it includes a description of the test methods used, the limits of the tests, and the actual results. Part 111 binds dietary supplement makers; it is cited here as a benchmark for what a usable certificate contains, not as a rule that applies to your clinic.
Put those together and you have the checklist in the short answer. A certificate that carries a purity percentage with no method, no limit and no lot is a marketing sheet with a number on it.
How does a certificate map to a full laboratory test report?
Independent laboratories that hold ISO/IEC 17025 accreditation report against a defined list of contents. The one-page certificate a supplier forwards is usually a summary of that fuller report, and the standard allows simplified reporting when the customer agrees to it (clause 7.8.1.3). Knowing the full list tells you what a summary may have left out.
| Certificate field | ISO/IEC 17025 clause 7.8.2.1 item | Why it matters |
|---|---|---|
| Lab name and address | (b) name and address of the laboratory | Tells you who to call to confirm the report |
| Report or certificate number | (d) unique identification of the report | The number the lab will confirm against |
| Product, grade and lot | (g) description and unambiguous identification of the item | Ties the results to your lot |
| Date received and date tested | (h) date of receipt and (i) date of performance | Shows the sample existed when the results say it did |
| Date issued | (j) date of issue | Should follow the test date, not precede it |
| Method | (f) identification of the method used | Without it a result cannot be reproduced or compared |
| Results with units | (m) results with units of measurement | The numbers themselves |
| Signature | (o) identification of the person authorizing the report | Someone is accountable for the content |
| Statement of scope | (l) results relate only to the items tested | A reminder that the lab vouches for the sample, not your vial |
The crosswalk of these items published by NIST is the easiest public reference to keep beside a certificate. When a certificate is one page, ask the supplier for the full report behind it; a real laboratory produced one.
What should you look for on the worked example?
EV-01 is the independent laboratory report for lot IGF1A122925, the example lot used throughout this series. Reading it field by field, in the order the checklist runs:
The header names the laboratory and gives its address, which is what you will use to confirm the report independently. The sample identification names the lot, and that lot number should match the vial label character for character. The method line reads HPLC-UV-MS, which means purity was measured by liquid chromatography with ultraviolet detection and identity was checked by mass spectrometry. The purity result reads 99.80%, and a result that precise should sit beside an integrated chromatogram, not stand alone. The dates show when the sample was received, tested and reported, and they should run in that order. The signature block names who authorized the report.
Two things the example teaches. First, a good certificate has more fields than most people read, and the ones people skip (method, dates, signature) are the ones that separate a record from a claim. Second, a certificate from an independent laboratory and a certificate from the manufacturer are different documents with different jobs; Manufacturer COA vs Third-Party Lab Report: What’s the Difference? explains why the strongest lot file holds both.
Which fields are most often missing, and what does each absence mean?
The same five gaps appear again and again on peptide certificates.
No lot number. The certificate may be genuine, but it is not evidence about your vials. It cannot be matched, so it cannot release a lot.
No method. A purity figure without a method cannot be reproduced, and different methods give different numbers for the same material. Why Should a Peptide COA Include the Chromatogram, Not Just a Purity Number? covers what the trace adds that the number cannot.
No acceptance limits. A result is only a pass or fail against a specification. A certificate that shows 98.6% without saying what the limit was has not told you whether the lot passed anything.
No signature or date. Nobody has taken responsibility for the content, and you cannot tell when it was written.
No laboratory address or phone number. You cannot confirm the report independently, which is the single most useful thing a certificate lets you do.
Each absence is a question for the supplier, put in writing. A supplier who can fill the gap will do so quickly; a supplier who cannot has told you something about the lot.
What should a clinic’s certificate checklist say?
The list below is the one the Helios receiving record uses; a printable version sits on the evidence page for EV-01.
Product name and grade match the vial label.
Lot number matches the vial label exactly.
Release date, and expiry or retest date, are present and in logical order.
Every test lists a method, an acceptance limit and a numerical result.
The purity result is accompanied by the chromatogram.
The certificate is dated and signed by a named person.
The laboratory’s name, address and phone number are present.
If the certificate was issued by a distributor or repacker, it names the testing laboratory and attaches the original manufacturer’s certificate.
The full laboratory report is on file when the certificate is a summary.
What Can a Peptide COA Not Tell You? is the companion to this list: a certificate that passes all nine items still speaks only for the sample the lab received, on the date shown.
How Helios does it
Under the Helios verification standard, step 2 requires a lot-specific certificate set before a lot ships: the manufacturer’s certificate and an independent laboratory report for the exact lot, each carrying the fields in the checklist above. A certificate that arrives without a lot number, a method or a signature is treated as missing, and the lot does not move out of quarantine until a complete one is on file. Helios Consultants LLC describes all seven steps in how Helios verifies every lot. If you want help setting this up in your clinic, book a consultation.
Related questions
How Can a Clinic Verify the Exact Batch of a Peptide It Receives?
Why Should a Peptide COA Include the Chromatogram, Not Just a Purity Number?
Manufacturer COA vs Third-Party Lab Report: What’s the Difference?
What Can a Peptide COA Not Tell You?
Which Tests Should a Complete Peptide COA Include?
Sources
ICH Q7, Good Manufacturing Practice Guide for Active Pharmaceutical Ingredients, section 11.4. View source
21 CFR 111.75, What must you do to determine whether specifications are met? eCFR. View source
NIST, ISO/IEC 17025:2017 crosswalk, clause 7.8 Reporting of results. View source
Educational content for licensed professionals. Not legal or medical advice. No product is offered for sale on this page.