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Peptides

Common GLP-1 peptide blind test

Semaglutide, tirzepatide or retatrutide — blind. You do not tell us which you suspect.

The most-ordered peptide test there is. Send one unopened vial and we identify which of the three GLP-1 peptides is inside, measure how much is in the vial, and report peptide purity. If the vial contains a mixture, every component is identified and measured separately. Blind means blind: you do not have to declare what you think is in there, which is what makes the result worth anything to a third party.

What this test tells you

Identity — LC-MS

Confirms the molecule is what the label claims, by measuring the mass of the eluting ions. Catches substitution and the wrong compound entirely.

Content — quantitative HPLC

How much is actually in the vial, compared against the declared strength and reported as a percentage of claim.

Purity — HPLC-UV

Area percent of the main peak, with the chromatogram attached so the figure can be checked rather than trusted.

A verifiable report

A report ID and unique key that resolve to a public record. Anything that does not resolve is not a genuine report.

Parameters
Target compoundsSemaglutide, Tirzepatide, Retatrutide
Other namesSema, Tirz, Reta, RT30, TR30
CAS — Semaglutide910463-68-2
Molecular weight — Semaglutide4113.6
CAS — Tirzepatide2023788-19-2
Molecular weight — Tirzepatide4813.5
CAS — Retatrutide2381089-83-2
Molecular weight — Retatrutide4731.3
Testing methodRP-HPLC-UV 214 nm + ESI-LC-MS
Detection limitbelow 1/20th of a usual dose per vial
Result formatmg per vial, purity %, identity confirmed
Minimum sample1 whole unopened vial, or 30 mg raw API in a sealed glass vial
Frequently asked questions
Do I have to say which peptide it is?

No. That is the point of a blind test. We identify it from the sample.

What if the vial contains a blend of all three?

Then all three are identified and measured. Purity may be reported per component rather than as a single figure.

Can you test a 60 mg or 100 mg vial?

Yes. Vial size does not change the price; the assay scales.

Additional services

Add any of these to the same vial, on the same certificate.

Optional add-ons

  • Raw data packageChromatogram and mass spectrum as open files, not just PDF.
    +$18
  • pH measurementMeasured on reconstituted sample, reported to 0.01.
    +$27
  • Fentanyl presence screenTargeted LC-MS screen. Reported present / not detected.
    +$55
  • Variance testingTwo independent injections from the same vial, reported separately.
    +$55
  • Additional report copyA second certificate issued under a different origin label.
    +$37
  • Heavy metals (ICP-MS)As, Cd, Pb, Hg. Reported per element, <0.01 ppm.
    +$125
  • Endotoxin (LAL)Kinetic LAL, reported in EU/mg. Requires a second vial of the same compound.
    +$210
  • CHNS mass reportElemental composition, independent of the HPLC assay.
    +$105
  • LC-MS contamination screenScreens for unrelated peptides and small molecules.
    +$150
  • Sterility (TAMC + TYMC)Compendial sterility. 14-day incubation. Requires a second vial.
    +$179
  • TFA content analysisResidual trifluoroacetic acid, reported as % w/w.
    +$210

Not sure this is the right test?

Describe the sample and we will tell you what to order — or whether we can test it at all.

Ask us