Every research-peptide seller waves a “Certificate of Analysis” at you. The problem is that a COA is only worth something if you can actually read it — and a faked, recycled or self-graded certificate is one of the oldest tricks in this market. When urologist Dr Alex Tatem warned on The Diary of a CEO that buying unverified peptides is like “getting gas station sushi… because there isn’t any quality control,” this is the skill that protects you from exactly that. Here’s how to verify a peptide COA in the UK, what every number means, and how to tell a real Janoshik report from a pretty picture.
Key takeaways
- A real COA is batch-specific — it matches the exact vial you’re buying, not “a” vial from last year.
- Look for HPLC (purity) and mass spec / MS (identity), ideally from an independent lab like Janoshik.
- You want ≥99% purity, a matching peptide mass, a batch number and a recent date.
- Where possible, verify the report directly with the testing lab — many now offer a scannable check.
- If a “COA” is undated, generic, self-tested or unverifiable, treat it as no COA at all.
Why the COA became the whole game
A little context explains why this matters so much right now. As Dr Tatem describes, when the US banned 19 peptides in 2023, the regulated supply didn’t vanish — it went grey. He compares it to Prohibition: drive something underground and an unregulated, sometimes contaminated supply rushes in to fill the gap. In a market with no regulator checking the product, the Certificate of Analysis becomes the entire quality-control system. No COA, no way to know — it really is that binary.
What a COA actually proves
A Certificate of Analysis answers two questions: is this the peptide it claims to be? (identity) and how pure is it? (purity). Everything else on the page supports those two answers or tells you whether to trust them.
The parts of a peptide COA, decoded
| Section | What it tells you | What you want to see |
|---|---|---|
| HPLC | Purity — how much is the actual peptide vs impurities | ≥99% |
| MS (mass spec) | Identity — confirms the molecular weight matches the peptide | Observed mass matches expected |
| Batch / lot number | Ties the report to your specific vial | Present, and matches your vial |
| Test date | Recency of the analysis | Recent and clearly dated |
| Testing lab | Who ran it | Independent third party (e.g. Janoshik) |
| Quantity / net peptide | How much actual peptide is in the vial | Matches the labelled mg |
How to read the two numbers that matter
HPLC (purity). High-performance liquid chromatography separates the contents and measures what proportion is your target peptide. A reading of 99%+ means minimal synthesis by-products. Anything notably lower means you’re paying for filler or off-target fragments.
Mass spec (identity). This confirms the molecular weight of what’s actually in the vial. It’s the section that catches the nastiest fraud — a completely different, cheaper peptide sold under the right label. If the observed mass matches the expected mass for that peptide, the identity checks out. (This is also how you confirm, say, whether a “TB-500” vial is the fragment or full-length thymosin beta-4.)
How to spot a faked or recycled COA
- No batch number — or one that doesn’t match your vial. The number-one tell.
- No date, or a suspiciously old one reused across every product.
- A flat image with no lab letterhead or traceable source.
- Self-tested “results” with no independent lab named — marking your own homework.
- Purity that’s suspiciously perfect on a seller who won’t let you verify with the lab.
- A certificate for the right peptide but the wrong strength — a 5mg COA pasted onto a 10mg vial.
How to verify a COA directly with the lab
- Find the batch/lot number on the certificate and confirm it matches the vial.
- Identify the testing lab — an independent name like Janoshik is what you want, not the seller’s own initials.
- Use the lab’s verification tool where one exists. Several independent labs now provide a code or scannable link so a report can’t simply be edited in an image app.
- If the seller resists you checking — that resistance is the answer.
Why Janoshik comes up so often
Janoshik is an independent analytical lab widely used in the research-peptide space precisely because its reports are recognised and verifiable. A Janoshik HPLC + mass-spec report tied to your specific batch is about as good as third-party verification gets in this market — which is why credible UK suppliers use it and display it openly, and why chancers avoid it.
How MyReta does it
We publish batch-specific third-party COAs rather than asking you to take our word for anything. You can see our approach on the COA page and quality testing page. The same standard runs across the range — BPC-157, TB-500, MOTS-C and retatrutide alike. It’s also why our value guide argues for cost per verified mg, not the lowest sticker — the certificate is the thing you’re really paying for.
Frequently asked questions
What is a peptide COA?
A Certificate of Analysis — a lab report confirming a peptide’s identity (via mass spec) and purity (via HPLC) for a specific batch.
How do I verify a peptide COA is real?
Check it’s batch-specific, dated, names an independent lab, and matches your vial’s batch number and strength. Where possible, confirm authenticity directly with the testing lab.
What purity should a research peptide be?
Look for ≥99% on the HPLC result. Lower figures can indicate synthesis by-products or off-target material.
What is Janoshik?
An independent analytical lab commonly used to test research peptides, whose HPLC and mass-spec reports are widely recognised and verifiable.
Is a COA legally required to sell peptides in the UK?
No — which is exactly why it’s such a useful trust signal. Serious suppliers provide one voluntarily; risky ones don’t.
The bottom line
A COA you can’t read is just decoration. Check for batch-specific HPLC (≥99%) and mass-spec results from an independent lab like Janoshik, confirm the batch number, strength and date, and verify with the lab where you can. Do that and you’ve solved Dr Tatem’s “gas station sushi” problem for good. See real examples on our quality testing page.
This article is for informational and research purposes only. The peptides referenced are supplied for laboratory research use only and are not for human consumption. Nothing here is medical advice.