Know what's
in the vial.
Mail your research peptide to our independent laboratory. We measure identity, purity, quantity and contaminants, then send back a verified Certificate of Analysis. No guessing. No marketing claims. Just data.
of peptides bought online don't match their label.
Independent testing keeps finding research peptides that are underdosed, mislabelled, or contaminated, with lead and arsenic above international toxicity limits, truncated sequences, and leftover synthesis byproducts. The vial says one thing. The data says another.
You can't see purity. You can't taste contaminants. The only way to know is to measure it.
Three steps. One verdict.
From your door to a verified Certificate of Analysis. The whole process is built to be simple, anonymous, and fast.
Order your test
Choose the Identity/Purity or Contaminant test, or the complete panel. Pay online in under a minute and we'll email your lab reference and where to post your vial.
Mail your vial
Drop your sealed vial in the post to our lab, no name required, just your reference. A few milligrams is all we need to run the full analysis.
Get your CoA
You receive a tamper evident Certificate of Analysis covering identity, purity and safety, each one publicly verifiable by certificate number.
Flat rate testing. No subscriptions.
One transparent price per vial. Bundle the Identity/Purity and Contaminant tests and save $99. Sending more than one vial saves another 10%.
Identity, Purity & Contaminant Test
Everything from peptide and contaminant testing, on one tamper evident Certificate of Analysis.
- Identity by MS
- Purity by HPLC-UV
- Net peptide content
- Contaminant screen by ICP-MS
- Lead, arsenic, cadmium & mercury
- Detection to parts per billion
Contaminant Test
The heavy metal residues that actually hurt people, screened out of your vial.
- Contaminant screen by ICP-MS
- Lead, arsenic, cadmium & mercury
- Detection to parts per billion
Identity/Purity Test
What the compound is, how pure it is, and how much is really in the vial.
- Identity by MS
- Purity by HPLC-UV
- Net peptide content
Real instruments. Documented methods.
Every result is produced under our accreditation scope and traceable to certified reference standards, the same methods used by pharmaceutical QC labs.
Identity
Confirms the molecular mass and sequence match the declared peptide, not a lookalike or fragment.
Purity
Separates and quantifies every component, reporting purity by area at 214 nm.
Contaminants
Heavy metals: lead, arsenic, cadmium and mercury, down to parts per billion against ICH Q3D limits.
A validated method for every peptide.
Library growing every month
We don't run one generic assay across everything. For each compound in our library, our scientists develop and validate a dedicated method — characterising its unique chromatographic fingerprint, confirming its molecular mass, and setting purity and quantitation parameters specific to that molecule. That rigour is what makes a result mean something.
Characterised, not assumed
Every peptide has a signature retention time and peak profile. We establish that fingerprint against a certified reference standard, so identity and purity are measured against the real molecule.
Confirmed by mass spec
LC-MS/MS confirms the exact molecular mass and sequence — proving the vial holds the peptide it claims, not a truncated fragment, analogue or look-alike.
A growing library
We're constantly developing and validating methods for new research peptides. The library grows every month, with new reference standards added as we go.
Peptides we currently test — not listed? email us and we'll confirm if we can run it:
Peptide not on the list?
We add new research peptides all the time. Email us the compound you'd like tested and we'll confirm whether we can validate a method for it.
A certificate you can actually trust.
Every test returns a holographic, tamper evident Certificate of Analysis. It's not a screenshot or a number in an email. It's a real lab document, and anyone can verify it.
- Independently verifiable Every certificate carries a unique number and access key anyone can check against our records.
- Tamper evident A holographic seal and traceable signatory make a peptester CoA hard to fake and easy to authenticate.
- The actual data HPLC chromatogram, MS spectrum and measured results against published specifications, not just a green tick.
Got a CoA? Check it's real.
Enter the certificate number printed on any peptester document to confirm it was issued by our lab and view the original result.
We don't sell peptides.
That's the whole point. We have no product to protect and no batch to defend. Our only job is to tell you the truth about what's in your vial.
Genuinely independent
No affiliation with any vendor or brand. We never resell, white label or take commissions. The result is the result.
Real lab methods
Methods to ISO/IEC 17025, run in a GMP facility, against certified reference standards.
Radically transparent
Flat pricing, published methods, and certificates anyone can verify. No black boxes, no marketing grade purity.
Questions, answered.
We need a full, unopened vial to avoid any risk of contamination, and lyophilised (freeze-dried) powder only. Send it sealed exactly as supplied. Please don't open or reconstitute it.
We don't ship sample kits. You simply post your vial to our lab. Expected turnaround is 10 business days from the day your sample is received. Your Certificate of Analysis is emailed as soon as it's signed off, and is verifiable online immediately.
Yes. We identify samples by reference number, not by name. We never publish who submitted a sample, and your results are yours to share or keep private. We only need an email address to send your certificate.
Absolutely, add as many vials as you like to a single order and 10% comes off the entire order automatically at checkout. Each vial is tested and certified separately.
No. peptester provides analytical testing for research purposes only. Our certificates describe the sample as received and are not medical advice, a quality endorsement, or approval for human or veterinary use.