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Retatrutide testing in Canada

No approved retatrutide product exists anywhere in the world, so there is no reference product to compare a sample against. Identity confirmation carries more weight here than for anything else we test.

$249CAD

Results in about five business days from arrival

Order this test
  • Identity by LC–MS/MS
  • Purity, with the method stated
  • Net peptide content in mg
  • Chromatographic peak data
  • Certificate anyone can verify

What retatrutide actually is

A 39-residue peptide with a C18 fatty diacid at Lys30. It is the most expensive of the GLP-1 family to synthesise, which is precisely why substituting something cheaper is worth someone's while.

Residues
39
Formula
C221H342N46O68
Mol. weight
4731.3 Da
Also called
LY3437943

Nothing official to check it against

No reference product

Retatrutide has no approved pharmaceutical form in any jurisdiction. There is no legitimate supply chain to trace a vial back to and nothing official to compare it against.

That makes the analytical result the only evidence available about what is in the vial.

The 82-dalton problem

Tirzepatide sits extremely close in mass, and it is cheaper.

4731.3  vs  4813.5

Retatrutide against tirzepatide — 82 daltons apart, about 1.7%

That is the difference between a 5 kg bag of flour and one with an extra 85 grams in it. Separating them reliably takes genuine mass accuracy rather than a nominal figure. How mass spectrometry tells them apart.

What the largest dataset found

67.8%

of retatrutide samples met both compounding criteria — the best result of any compound in the dataset, and 47.0% under the stricter manufactured standard. Retatrutide was also the second most-tested compound, at 507 vendor-peptide pairings.

Mendias C, Awan T, 2026 — 6,441 grey-market samples across 14 compounds and 203 synthesis companies. Posted as a preprint; not peer reviewed. The dataset is self-selected third-party testing, so buyers who already suspected a problem are over-represented. Full findings and caveats.

What your certificate reports

  1. Identity — confirmed from precursor-to-product-ion transitions on a triple quadrupole instrument, not inferred from retention time.
  2. Purity — measured at the quantifying transition, with the method named on the report.
  3. Net peptide content — quantified against an external calibration curve and reported as its own figure, in milligrams. Why this is a different number from purity.
  4. Peak data — the chromatographic results behind each figure, printed on the certificate rather than held back.

Common questions

How much sample do you need?

One unopened vial. Detailed posting instructions arrive with your order confirmation, immediately after you pay.

Does it need to be shipped cold?

No. Lyophilised peptides travel safely at room temperature, which is how nearly all samples reach us.

Who actually performs the analysis?

An independent Ontario laboratory. Every certificate we issue names the facility that ran it — we are a testing service, not a laboratory, and we would rather say so than let you find out from the report.

What if the result comes back bad?

You get the result. We do not soften findings, and we do not charge differently depending on what the analysis shows.

Can I verify the certificate is genuine?

Yes. Every certificate carries an identifier that anyone can check against our records, including the vendor you bought from.

Related reading

ExplainedHow labs know what is in a vialMass spectrometry without the jargon, and why weighing beats timing.ExplainedPurity is not contentA vial can be 99% pure and hold a quarter less peptide than the label says.Related testTirzepatide testingThe compound most often supplied in its place.

Test your retatrutide

$249 CAD · about five business days from arrival · never leaves Canada

Order this test